DOLABELLA. U7 
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, ete. 
Cosseir, Red Sea. 
D. hemprichii EnRENB., Symbole Physice, ete., Decas prima, 
(1828 or later). 
D. ecaupaATA Rang. PI. 66, figs. 11, 12, 13 (type); pl. 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. rwmphii 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 Wargiou, Moluccas ; Islet of Pangai-Modou, near Ton- 
gatabu (Quoy & Gaimard); Upolu (Godeffroy Exp., in coll. A. N. 
8. 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 133 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 
