94 



iront groove conspicuous, ending at a short distance from the apex ; notch conspicuous but not 

 deep, subquadrate. Sides of the shell slightly raised and even a little turned up. 



Long. 11% lat. 7 S / +1 alt. 2 1 /, Mill. 



This species has a slight resemblance with the upper view of 5. imbricata A. Ads., as 

 fioaired by Pilsbrv (Man. of Conch. Vol. XII, PI. 29, figs. 14, 15), but the apex is placed much 

 more towards the posterior end, it differs also in colour and in many other particulars. As 

 usually with the species of Adams, no measurements are given, even no mention has been made 

 of the relative altitude of the shell. 



3. Subemarginula dubia n. sp. PI. VIII, fig. 3. 



Stat. 126. 3°27'.iN., I25°i8'.7E. 2053 M - Haid bottom. 1 Spec. 



Shell small, conical, compressed, oval, apex worn, placed slightly posteriorly, front. and 

 posterior slopes slightly convex, side slopes straight. Colour white, covered by a brown epidermis. 

 Sculpture consisting of about 18 strong, radiating ribs and numerous intermediate riblets and 

 striae; ribs crenulated. Margin thin crenulated by the ends of the ribs. The front rib is stronger, 

 with a point at the margin. Interior smooth, white, with a conspicuous groove, corresponding 

 to the front rib. Muscle-scar only slightly hooked inward. 



Long. 4 1 /,, lat. 2 1 /., alt. i 1 /, Mill. 



This species has much puzzled me, as the small animal was too much contracted to allow 

 a sufficiënt study of it. As the apex is placed posteriorly, it is no Patclla or Acmaea\ it might 

 perhaps belong to Phenacolepas or to a new genus, but the internal groove on the front side 

 has induced me, to describe it provisionally as a Subemarginula. 



Scutus Montfort. 

 1 . Scutus unguis Linné. 



<*> 



LlNNÉ. Mus. Ulricae, p. 69 {Patclla). 



Reeve. Conch. Ie. Vol. XVII, Scutus, fig. 7 [corrugatus). 



PlLSBRY. Man. of Conch. Vol. XII, p. 291, PI. 40, figs. 4 — 8. 



Stat. 248. Ruma Lusi, N. point of Tiur-island. 36 M. 1 Spec. 

 Stat. 250. Kilsuin, West coast of Kur-island. Reef. 1 Spec. 



The specimen from the last-named locality is nearly covered by the mantle of the 

 animal. For the anatomy and other localities, see Appendix by Prof. Bergh, for a figure of 

 the living animal PI. III, fig. 20 of monograph L of this work (R. Bergh, Die Opisthobranchia 

 der Siboga-Expedition). 



94 



