116 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 8 



Distribution. — From Monterey Bay to Santa Cruz Islands, off Santa 

 Barbara County, southern California. 



Specimens examined. — The type and numerous individuals, preserved 

 as well as living, from Monterey to Santa Cruz Islands. 



Remarks. — Differs from the other 2 species in the color and the much 

 heavier spicules. 



2. Pachythyone lugubris (Deichmann) 

 Plate 23, Figs. 7-9; text figure 6 



Thy one lugubris Deichmann, 1939, p. 1, text figures 1-2. 



Diagnosis. — As for the genus. Color mottled brown. Spicules slightly 

 smaller and more delicate than in P. rubra; tentacles without knobbed 

 plates. Rosettes absent or rare. Viviparous. 



Holotype.— U.S.N. M. 



Type locality. — Magdalena Bay, west coast of L. Calif., 10-15 fms. 



Distribution. — Between Magdalena Bay and Cerros Island, west 

 coast of L. Calif. 



Depth.— 10-40 fms. 



Specimens examined. — The types and the following specimens from 

 the Velero Expeditions : 

 283-34. Thurloe Bay, L. Calif., 8-10 fms., off Thurloe Point, March 9, 



1934, 5 specimens. 

 287-34. South Bay, Cerros Island, Mex., 10-15 fms., March 10, 1934, 

 12 specimens. 



Remarks. — The type, a female, contained 13 embiyos (collected in 

 June). In the Hancock material collected earlier in the year no embryos 

 were discovered. 



While the type material appeared to be devoid of rosettes in the ten- 

 tacles, a few were found in the Hancock material which came from a 

 much more northern locality. 



3. Pachythyone pseudolugubris, new species 

 Plate 22, Figs. 9-10; Plate 23, Figs. 1-6; text figure 6 



Diagnosis. — Medium-sized form (up to 5 cm. long). Resembles 

 lugubris in the external and inner anatomical features. Spicules an exter- 

 nal layer of reticulated plates, an inner layer of regularly knobbed 4-holed 

 buttons rarely elongate and with accessory holes in the ends. Feet with 

 well-developed end plate; walls supported by numerous curved supporting 

 tables with a low spire or none in the ventral feet; in the dorsal a number 



