808 GASTROPODA. i fulmonatii-. 



Type in the Kgl. Museiun fiir Naturkunde, Berlin. 

 Hob. Auckland Islands (Dr. Krone, Professor Benham). 



Var. fasciatus (v. Mts.), Simroth, em. (fuscatus), i.e., 79. 



This variety is distinguished by its lighter colour, being yellowish- 

 brown, with a black median band following the median groove, and 2 

 narrow black bands on each side of it, indicated by streaks and spots. 



All the other characters and the anatomv are the same as in the 



i 



var. nigricans. The type is also in the same collection, and the habitat 

 is also the same. 



It seems to be more common than the black form. 



Tribe 4. DIGONOPORA. 



Male and female genital orifices distant. 



Fam, ONCHIDIID^!, Philippi. 



Animal oval, rarely rounded, naked, without a shell. The 

 dorsal surface smooth or uneven and more or less densely covered 

 with papillae, sometimes with frutescent appendages and oculiferous 

 tubercles. In front, below the mantle - edge and above the mouth, 

 is a strong roof-like frontal shield ; at the base of this and above 

 on either side is a strong cylindrical ommatophore, which is exsertile, 

 and bears an eye on its outer side ; at the sides the frontal shield is 

 prolonged into a tentacle. The foot is large and generally broad, 

 with fine longitudinal and transverse furrows ; it is divided into 

 three parts the median part or sole, and the side parts or hyponota, 

 which are a continuation of the dorsal surface, separated from it by 

 the perinotum ; the sole is truncated in front, narrowed and rounded 

 behind. Along the right side of the foot, between sole and hypo- 

 notum, is the female genital furrow, which is ciliated during life ; it 

 begins at the female orifice, near the posterior extremity, and is con- 

 tinued to the transverse groove separating head and sole ; in it the 

 sperm may be deposited, and, after being closed against sea-water 

 by lateral folds, conveyed to the female orifice. The anal orifice is 

 behind the end of the sole in the median line. The respiratory orifice 

 or pneumostome is behind the anus in the median line or a little to 

 the right. Above the anterior margin of the foot, and in the median 

 line, is the opening of the pedal gland. The orifice of the male organ 

 is always on the head. The heart has the ventricle anterior, as in 

 the Opisthobrancliia. Jaw very thin and transparent. Radula broad, 

 central tooth tricuspid, lateral and marginal teeth elongated, usually 

 numerous, with an outer denticle. 



Distribution. Tropical to temperate seas ; widely distributed in 

 the Indo-Pacific. 



