REPORT ON THE CIRRIPEDIA. .-,7 



hidden scuta. Filaments one pair, seated beneath the basal articulations of the first pair 

 of cirri; the mandibles have two or three teeth, the maxillae are notched, the caudal 

 appendages are multi-articulate. 



This genus forms the transition from those with distinct and well-developed valves 

 to the genus Anelasma, which is quite destitute of valves. In those species which are 

 furnished with scuta, these valves resemble in form those of Coitc/iorfcrnta, and according 

 to Darwin it shows also some affinity to this genus by the ovarian tubes in Alepas 

 cornuta surrounding the capitulum. According to this same author, Alepas has perhaps 

 a closer affinity to Tbla. But as I do not know this genus from personal investigation. 

 I think it better to refer to the work of Darwin. 



This genus has a world-wide range, though represented by a few species only, and 

 never by a great number of specimens. As to its range in depth, almost nothing is 

 known as yet. As a rule, they inhabit either the surface of the sea or rather shallow- 

 water. The new species, which will presently be described by me, is the first taken 

 from so considerable a depth as 410 fathoms. 



To determine the species of this genus, I have composed the following table : — 



Alepas. 



1. Scuta horny, covered by the integument of the capitulum. 



i. Orifice one-third of the length of the capitulum ; 



total length not quite half an inch, 1 . . Alepas minuta, 1'hilippi. 



ii. Orifice two-thirds of the length of the capitulum ; 



total length two inches, . . . Alepas parasita, Sander Rang. 



2. Scuta wanting ; orifice slightly protuberant. 



i. Inner rami of the fifth and sixth cirri rudimentary, Alepas cornuta, Darwin, 

 ii. Inner rami of the fifth and sixth cirri normal, . Alepas pedunculata, u. sp. 



3. Scuta wanting ; orifice tubular, protuberant, . . . Alepas tubulosa, Quoy et Gaimard. 



Alepas pedunculata, n. sp. (PI. III. figs. 1-5; PI. VII. figs. 10, II). 



Orifice slightly protuberant, small. Scuta wanting, capitulum globular, without 

 projections along the carina] margin. Peduncle a little longer than in the other species 

 of the genus. Outer maxillae with the inner bristles divided into two groups; segments 

 of the posterior cirri not very numerous, inner rami of the fifth and sixth cirri as strongly 

 developed as the outer rami. 



Capitulum globular, with the carinated edge smooth, entirely destitute of valves. 

 Colour, flesh-colour, dotted over with small red spots. Orifice slightly projecting or 

 tubular, parallel to the longitudinal axis of the peduncle, with the edges sinuous. As 



1 Darwin (loc. cit., p. 161), says that the total length of the largest specimen he examined was about oii t -fi>nr,li "I 

 an inch. I got specimens from the Gulf of Naples, the largest of which was almost 12 mm. In these hn 

 the scutum is almost entirely hidden. 



(ZOOL. CHALL. EXP. — PART XXV.— 1883.) lib 8 



