It) University of California Publications in Zoology. [Vol. 4 



sess the same character, B. elegans Herdman, has more in com- 

 mon with B. echinata than has any other species, but elegans is 

 wholly devoid of surface spines. B. houvetensis Michaelsen 

 (Michaelsen, 1904) is interesting in this connection as furnishing 

 a sort of intermediate condition between longitudinal and trans- 

 verse stigmata. According to INIichaelsen the stigmata in this 

 species are very irregular, some being long, some short, some 

 curved, some longitudinal, and some transverse. 



Culeolus pyramidalis, n. sp. 



PL 2, figs. 20 and 21. 



Superficial Characters. — Body rather regularly pyramidal, 

 slightly compressed, peduncle attached at apex of the pyramid 

 close to the branchial orifice and on its ventral side, fig. 20. 

 Base of the pyramid marked by the atrial orifice dorsally, the 

 papillary band laterally, and by a pronounced patch of longer 

 test papillae ventrally. Outline of base elliptical with long axes 

 of ellipse dorso-ventral : base strongly convex, fig. 21. Siphons 

 none. Surface in general even, but a series of not well defined 

 grooves radiating from the atrial orifice. Entire surface thickly 

 beset with minute papillae, and a distinct, sinuous papillary hand 

 marking off the base of the pyramid. Peduncle very long and 

 slender, of nearly uniform diameter throughout, terminating in a 

 disc provided with strong holdfasts. Color of body yellowish 

 gray; peduncle blue gray. Greatest length of body 2.5 cm., long 

 axis of elliptical base 2 cm., short axis of same 1.-5 cm. Length 

 of peduncle 19 cm. 



Test thin, scarcely 1 mm. thick, firm and leathery, bearing a 

 great number of low, conical papillae, each of which is situated 

 in a definite area of clear test; blood ampullae in the test sub- 

 stance, and extending into the longer test papillae of the band. 



Mantle thin and transparent except for the muscle bands, 

 which are. especially on the atrial portion of the body, rather 

 strong though not close together, the circular and longitudinal 

 running at nearly a right angle to one another, producing a large- 

 meshed network. 



Branchial Apparatus. — No siphous nor lobes for either orifice. 



