156 



K. MITSUKUEI : STUDIES ON 



Textfig. 26. 



circles and smooth margin ; spire 

 built of four pillars with one or two 

 transverse beams ; crown with com- 

 paratively long, pointed teeth, 16 or 

 more in number. Buttons (c) in a 

 layer below the tables, not thickly 

 crowded but scattered more or less 

 sparsely. They seem more numerous 

 in the ventral perisome. Rather 

 large, with 5 — 8 pairs of holes. I 

 can hardly find any with nine ,,,.,^,^^,^, caiifindcus : «, h- 

 pairs of holes as stated by Claek. Tables ; c-iMton. (xsoo). 

 These buttons form the supporting rods of ventral pedicels which 

 have well-formed end-plates. 



Remarks : — Stimpson's description is very unsatisfactory. It 

 runs as follows : " Body much elongated, of nearly tlie same 

 thickness throughout ; below, flattened and thickly covered with 

 stout suck er -bearing feet not arranged in rows. Dorsal surface 

 with about forty large conical cutaneous processes (or false feet) 

 sparingly scattered ; between which there are numerous cirriform 

 feet also diskless. Tentacula twenty, short, peltate with broad 

 discs. Color reddish brown ; below lighter. Length 1 J feet ; 

 thickness 1\ inches." 



Clark (lOOla, pp. 164—165) says of the species: "Its position 

 in the Genus Sticliopus is suggested by the flattened ventral surface 

 and the large warts and papilla) on the dorsal side, and is clear- 

 ly proven by the arrangement of the genital gland in two tufts, 

 one on each side of the mesentery. It reaches a length of over a 

 foot and is dark brown in color. It is easily distinguished from 

 other members of the genus by the remarkable calcareous de- 



