Of All Animals. 89

The anatomical structures of the specimen are identified as follows: **A. A.** indicates the upper fins situated near the lower portion of the thorax. **B** marks the superior angle and the uppermost part of the chest, while **C. C.** shows the breadth of the thorax, which is lined by the pleura. The transverse septum is located at **DD**. Among the internal organs, **E** represents the liver, **F** the heart, **G** the gallbladder, and **H** the spleen. Regarding the digestive system, **I** is the exit of the intestine, **K** marks the end of the stomach, and **L** the origin of the intestinal tract. Finally, **M** indicates the vent or anus, and **N** denotes the fins.