ASCIDIANS COLLECTED IN PUGET SOUND. 265 



Locality: Port Townsend; one specimen. 



This species is closely related to Polycarpa (? why not 

 Stijela) finmarkiensis, Kiser, from the north of Norway, 

 but differs in details of dorsal lamina, tentacles, &c. 



Fig. 5, PI. XIII., shows the only specimen from the 

 right side, natural size ; fig. 6 is the same from the dorsal 

 edge, to show the adhering area; fig. 7 is a part of the 

 branchial sac from the inside, magnified; fig. 8 shows the 

 alimentary canal and the gonads; and fig. 9 is the dorsal 

 tubercle and nerve ganglion. 



Molgula pug etiensis, n. sp. PL XIV., figs. 3 — 7. 



External appearance. Shape ovate, transversely elon- 

 gated, with the dorsal edge narrow and the ventral broader 

 and flatter. Both apertures close together near the ventral 

 edge of the anterior end. Surface covered with fine sand 

 grains, attached to delicate branched hairs. Colour dark 

 grey. Length (dorso-ventral) 2'2 cm., breadth (antero- 

 posterior) 1*4 cm., thickness, 8 mm. 



Test moderately thick, but very soft and flexible. 



Mantle fairly muscular. Branchial siphon with 6 

 prominent pointed lobes; atrial siphon square. 



Branchial sac with 7 folds on each side. Three or four 

 internal longitudinal bars on each fold. Stigmata long and 

 curved, arranged in large infundibula. 



Dorsal lamina a plain narrow membrane. 



Tentacles 14, large and small, placed alternately. 



Dorsal tubercle of cordate form, with the broader end 

 posterior. Horns not coiled. 



Gonads one ovate mass on each side. 



Locality: Off Victoria, Puget Sound; 5 fathoms; one 

 specimen. 



This is an ordinary-looking Molgula, but it does not 

 seem to agree with any previously described form, 



