136 Pub. Puget Sound Biol. Sta. Vol. 2, No. 42 



Balanus cariosus (Pallas) Darwin. Common shore barnacle. Devel- 

 oping embryos were found in the mouth cavity and liberated as nauplii. 



Balanus evermanni Pilsbry. Abundant form along shore. Develop- 

 ing embryos were found which were liberated as nauplii. 



Peltogaster sp. Found rarely as parasite on abdomen of hermit crabs. 

 Individuals full of developing nauplii were found in the summer of 1917. 

 The animals were also found in large numbers in the atrial cavity of the 

 tunicate, Styela gibbsii (Stimp.) Herd. The eggs had not yet begun de- 

 velopment. 



Bopyrid sp. Occasional. It is a parasitic isopod found in the gill- 

 chamber of shrimps. Males and females were found together, the female 

 full of eggs which were unfertilized. 



Cancer gracilis Dana. Common crab found in shallow water and in 

 trawling. One specimen was found with eggs in trawling off O'Neil 

 Island. The eggs masses were very large and the eggs in the early stages 

 of development (July 16, 1918). 



Cancer oregonensis (Dana) Rathbun. Found in shallow water on 

 rocky points near the Station. The females carry eggs during the summer. 



Petrolisthes eriomerus Stimpson. Found on rocky shores near the 

 Station. The females carry eggs during the summer. 



Lophopanopeus bellus (Stimpson) Rathbun. Found on rocky shores 

 near the Station. The females carry eggs during the summer. 



Oregonia gracilis Dana. Found at nearly all depths in the vicinity 

 of the Station. They are especially abundant on the piles of the Friday 

 near the Station. The females carry eggs during the summer. 



Scyra acutifrons Dana. Found on the northeast side of Brown Is- 

 land at 20-50 fathoms. The females carry eggs during the summer. 



Chordata 



Corella willmeriana Herdman. Abundant on wharves and flats in the 

 harbor and quite commonly brought up in trawling. The eggs are large 

 and clear and may be found in various stages of development in the atrial 

 cavity. This furnishes splendid class material thruout the season. 



Cynthia haustor Stimpson. A common tunicate on reefs at low tide 

 and in deeper waters. Eggs in various stages of development may be 

 found in the atrial cavity. 



Styela stimsoni Ritter. Common under rocks on reefs. The eggs were 

 large and clear but still remained in the ovary at the end of the session in 

 August 1917. 



Styela gibbsii (Stimpson) Herdman. Common under rocks on reefs. 

 The eggs were large and clear but still remained in the ovary at the end 

 of the session (August 1917). 



