ii\rilllilIL>.t: - Ifl.'KTXAM,. :j27 



I'eil, coveied with piipillse, ttesiiy coiiiixessed aiul cionical when viewed 

 thix)ng'h the inicioscupe. The tout is Imitr, oval, and ending in a point, 

 and somewhat rounded in front; it is yellowisli white in coh)ur. In 

 juvenile specimens the jiait between tlie mantle and the foot is l)hick. 

 The head is large and striated. The two eye tentacles are short and 

 situated near the mantle border. The mouth is vertical and has tieshy 

 lips. A very conspicuous groove lies by the upper side of the lips and 

 near the extremity of the eye tentacles ; this opening leads to the oviduct. 

 The penis is very elongated. It is cylindrical, vei-y twisted and attached 

 at the posteiior part of the animal neai' the intestine, and rising upward 

 becomes dilated near the stomach, and travels forwaid tt) the opening neai' 

 the tentacle. The anus is in the form of a rounded {)erforation in the 

 median line, and near the posterior border of the mantle. The lung 

 occupies all the posterior portion of the body of the animal. They com- 

 municate with exterior by the branchial plumes ; these papilla? stand 

 above the papillse on the posterior part of tlie mantle, and consists of 

 short perforated tubes, embedded in the dermal tissue of the animal. 



This Oiir/iidiiiDi is essentially marine, and we found it many feet 

 below the surface of the harbour at Dorey, New Guinea (Lassuu). 



Onchidium atek, Lcssuu. 



OnchidluiH. liter, Lesson, Voy. "Coquille," Zool., ii., 1830, p. 300. 



Onoidiella atra (Lesson), Tapparone Canefri, Faun. Mai. N.Guinea, 1863, 

 p. 212. 



Di'scriptinit. — This OiicJiidiiiiu is from twelve to fifteen lines in length, 

 oval, ver}-^ convex and somewhat leddish on its suiface. Its mantle is 

 thick and f!esh\- and overhangs the foot. The surface is lightly granulated 

 with a deep black coloui" and some small white veins. The sides of 

 the mantle are thick, and lighter in colour. The foot is oval, transversely 

 striated, pointed and notched at the posterior part to receive the latter 

 part of the intestinal tube. At the sides and on the upper part of the 

 mantle are the branchial plumes, to communicate with the lungs. The two 

 eye tentacles are sluut and placed near the anterior border of the mantle. 

 The head is "-lobular, haviiior below thick lips around the mouth ; this latter 

 is rounded and small. The foot is yellow. The penis is very long, cylin- 

 drical, twisted at the posterior part and becomes a long contractile tube 

 enveloped in a thick membrane. A tube connects with the oviduct at the 

 opening near the right of the foot. This Onchidium inhabits the harbour 

 of Dorey, New Guinea (Lesion). 



OXCHIUICM liUANULOSDM, Lei>su>l . 



i)i<rliiilii(ui i/rminlosoiii, Lesson, Voy. lie la "Coquille", Zool., ii., 1830, p. 



299, pi. xiv., fig. 2. /'/., Semper, Reis. im Arch. Phil., iii., Landmoll., 



v., 1882, p. 289. 

 ( J ni'lt I dium granulosa (Lesson), Gray, Fig. Moll. An., iv., 1850, p. 117. 

 Oiicidiella granulosa (Lesson), Tapparone Canefri, Faun. Mai. N.Guinea, 



1883, p. 212. 



