G58 TAC.H SKOC.SilKHC. 



200—11 m.: 23. VI. 100-2: temju'raturo at '_'(•(» m.. ->",25 V.: 1 juvoiiis; i{. .M. S. tZ.ST. S. A. E., 

 PI. station To l>. l.it. 4<t" AG' S., lung. 4y" r.U' W.; dopth, U700— m.; 27. \ 1. l'J()2; tciiiporaturo 

 at 2700 m. and at tlio surface, + 1''.07 C. and 3'',40 C. resp. : 2 mature males, 3 mature females 

 and 1 juvenis; H. .M. 8. 238. 



l>i)^tribufion: — According to Ci. W. Mii.l.i:!; in the .\tlantic. Indian and Pacific Oceans. 

 In the Atlantic {.Vntarctic Ocean) as far as lat. 05" S. 



The specimens investigated by me were caught in the region ol distrihution previously 

 known. 



Conchoecia isocheira G. W. Muller. 



Conchuecia iMic/ieira, G. ^\'. :\It'l.i.r;ii, 1006 a, p. 84; pi. XIV, figs. 28 —31 ; |)1. XV, fig.s. 30—33. 

 „ „ „ „ l'J06c, p. 4. 

 „ „ „ „ 1908, p. 70. 

 „ „ „ 1912, p. 77. 



Descriptiun: — See ti. W. MOlleh, 1906 a, p. 84. 



Sufflementary description : — Male: — 



Shell: — Length: According to G. W. Mt'LLER, 0,9 mm. The specimens investigated 

 by me were also of this length. Length : height about 1,7 : 1; length : breadth about 2,3 : 1. 

 Seen from the side it is of the type described by G. W. MCller. Seen from 

 below it has its greatest width at about the middle, with uniformly and rather strongly curved 

 side contours, the anterior end rather narrowly roimded, with about a symmetrical rostrum, 

 the posterior end somewhat pointed and the anterior and posterior ends of the shell about the 

 same size; cf. the accompanying fig. 2, o = $. The shoulder vault is very weakly developed 

 and well rounded. The surface of the shell is bare or has only a few exceedingly 

 short hairs. Seen from inside: Selvage : This is of the same type as in C. rotundata 

 or else it is practically quite smooth-edged. The glands are as established by G. W. MCller; 

 it is to be noted that the dorso-medial glands are quite absent both in males and females, 

 contrary to what is the case in C. rotundata, in which, though weak, they are found in the male, 

 and unlike in most other species of this genus. The medial glands along the posterior margin 

 of the shell are about similar to those of C. rotundata. There is no distinctly developed hinge- 

 socket or hinge-tooth at the posterior dorsal comer of the shell. 



First antenna: — This is of the type described and reproduced by G. W. MOller. 

 E-bristle: This has from seven to nine spines situated in a .single row. Each of these spines 

 has distally a moderately large, oval, hyaline appendage (something Hke a suctorial organ; 

 cf. the accompanying figs. 3 and 4). The secondary bristles on the anterior side of this bristle 

 are like those of C. rotundata. The b- and d-bristles have a moderate number or rather few 

 exceedingly fine distally pointing spines at about the corresponding place to that of the spines 



