DOLABELLA. 157 



membrane. Dorsal slit 21 lines long, ending in a round orifice 

 above the middle of posterior disk. Tentacles over two inches from 

 anterior end of slit, 6-9 lines from buccal tentacles. Shell hatchet- 

 shaped, 16 lines long, with deflexed rudimentary twisted spire. 



Near to D. rumphii in size of shell and form of body, but without 

 cirri, etc. 



Cosseir, Red Sea. 



D. hemprichii EHRENB., Symbolse Physicse, etc., Decas prima, 

 (1828 or later). 



D. ECAUDATA Rang. PI. 66, figs. 11, 12, 13 (type) ; pi. 25, figs. 4, 

 5 (tongana Q. & G.). 



Under the above name may be united several described forms 

 agreeing in having the body almost smooth, with low tubercles only, 

 which disappear in large part in alcoholic specimens; tentacles aris- 

 ing unusually near each other ; posterior area or disk bounded by a 

 fleshy ridge which is plain and wavy, not serrate or bearing pro- 

 cesses. 



The color in life is green ; preserved specimens varying from 

 blackish-olive to dirty buff. 



Shell having the general form of that of D. rumphii but narrower, 

 the border of growth straighter, less convex ; shoulder rather less 

 produced upward. The cuticle is thin, yellow, fading to whitish 

 above ; margins having rather narrow reflexed borders. 



Rawak and Waigiou, Moluccas ; Islet of Pangai-Modou, near Ton- 

 gatabu (Quoy & Gaimard) ; Upolu (Godeffroy Exp., in coll. A. N. 

 S. P.) ; Home Is., N.-E. Australia (Brazier). 



This species is most nearly allied to D. californica Stearns, but the 

 shell of that has the internal border of the shoulder thickened and 

 rugose and the apical callous heavier and rougher, and the two are 

 widely separated geographically. As my synonymy of ecaudata is 

 not based upon a study of types, I give below the descriptions of the 

 several forms included. 



D. ecaudata Rang. PI. 66, figs. 11, 12, 13. Length 13* cm. 

 Smaller thau D. rumphii, and having no trace of a tail. Surface of 

 body having above, in front, some flat tubercles. Border of the pos- 

 terior disk not fringed, but merely irregularly undulated. Posterior 

 tentacles arising very close to each other. Color, greenish. 



Shell more calloused on the lower surface of the summit than in 



