812 GASTROPODA. \[ J ulmonala. 



reticulated with white and black, or the larger papillae are surrounded 

 by a whitish circle ; front of head and tentacles blackish ; perinotura 

 and sole greyish-white. Anal orifice underneath the tip of the tail, 

 and the pneumostome close behind it, also in the median line, and on 

 the hyponotal line. Hyponota of the same width as the sole, which is 

 long and narrow, rounded behind, and smooth. 



Length over back, 23 mm. ; breadth, 16 mm. ; height, 7 mm. 

 Width of sole. 5 mm. 



Jaw small, transparent. 



Radula with the central tooth tricuspid, the cusps elongated and 

 slender ; the marginal teeth with 2 slender cusps, the teeth angled 

 at the middle. 



Reproductive Organs. The vesicula seminalis is fairly large ; the 

 appendicular gland is of enormous size ; the oviduct, after separation 

 from the vas deferens, forms a narrow tube, which unites at a short 

 distance with the very thick neck of the receptaculum seminis, which is 

 quite exceptional in the genus, as the receptaculum seminis usually 

 joins the oviduct near the female genital orifice. At the anterior 

 third of the oviduct is a half-circular muscle, and opposite it enters 

 the tubular gland of the oviduct. The male organ has posteriorly a 

 roundish csecum, containing calcareous concretions. 



Type in the Mus. Hist. Nat., Paris. 



Hob. North and South Islands of New Zealand ; Chatham Islands 

 (E. Pv. Waite). The type is from Astrolabe Bay. 



Remarks. The sculpture and the colouring are very variable ; the 

 marginal glands are sometimes very indistinctly marked with white ; 

 Quoy and Gaimard's figures show their number to be 18. Specimens 

 from the north of New Zealand are usually much larger than those 

 from the south. 



5. Onchidella obscura, Plate, 1893. 



Oncidiella obscura, Plate, Zool. Jahrb., Anat., vii, 1893, 207. 



Animal fairly large, oval, blackish, smooth. Sculpture : Notum 

 quite smooth ; hyponotal line distinct, the outer part of hyponotum 

 smooth. Colour black ; under a lens small white points are visible, 

 and amongst them are larger ones, visible to the naked eye ; there are 

 large irregular yellowish-white spots and streaks which give the notuni 

 a speckled appearance ; these streaks have very often a darker spot 

 in the centre, and inside it one of the larger white points. The marginal 

 glands are equidistant, distant about 2 mm., their number being 19. 

 Anus covered by the tip of the sole ; pneumostome in the median line 

 behind it. Breadth of hyponotum one-half to three-quarters that of 

 the sole. 



Length, 14-5 mm. ; breadth, llmm.; height, 6mm. Width of 

 sole, 5 mm. 



