682 TAGE SKOGSBERG 



P.'ieudoconchoecia serrulata, C. Claus, 1891 a. p. 72: pi. XIX; pi. XXIII, figs. 1—13. 



G. S. BRADV. 1897, p. 96; pi. XVII. figs. 22—24. 

 Conchoecia „ CI. W. Muller. 1906 a. p. 97; pi. XXII, fig. 24; pi. XXIII, 



figs. 20—33. 

 Pseudoconchoecia „ var. laevis, G. S. Brady. 1907. p. 2. 



Conchoecia „ G. W. MCller. 1908, p. 73. 



(serrulata + laevisj, G. W. MCller, 1912. pp. 81 and 82. 



Description: — See C. Claus 1891a, p. 72 and G. W. Muller, 1906 a, p. 97. 



Supplementary description: — Male: — 



Shell: — Length: C. Claus states this as 1,4 — 1,6 mm. (no difference between males 

 and females). According to G. W. MtiLLER it is 1,25 — 1,4 mm. ,,die des Indischen Oceans 

 deutlich kleiner". The specimens investigated by me measured 1,05 — 1,4 mm. Length : height 

 about 1,6 : 1; length : breadth about 1.7 : 1. Seen from the side it is of about the 

 tyiJe reproduced by C. Claus, 1891 a. pi. XIX. fig. 1 (see the accompanying fig. 1), i. e. it has 

 a somewhat less arched ventral margin than in G. W. Muller's pi. XXII, fig. 24, 1906 a. 

 Seen f r o m below its greatest width is at about the middle, and, owing to its shoulder 

 vault being very powerfully developed, the anterior part of the shell is somewhat larger than the 

 posterior part. Owing to the powerful development of the shoulder vault a sinuation is produced 

 somewhat behind the middle; apart from this the side contours are evenly curved. The anterior 

 end is rather broadly rounded and has a symmetrical rostrum, the posterior end is also rounded 

 or somewhat pointed; cf. the accompanying fig. 2. As has already been pointed out, the shouldei 

 vault is very powerfully developed, but well rounded. The surface: The sculpture varies, 

 sometimes being rather powerfully developed, of about the type described by G. W. ML'LLER, 

 sometimes more or less weak, the striation having more or less completely disappeared just as 

 ,,the marginal serrulations"; specimens with reduced shell-sculpture have so far been found only 

 in the Antarctic; cf. p. 686 below. The surface of the shell has no hairs. Seen f r o m inside: 

 Selvaoe: This is smooth-edged on the rostrum and along the anterior margin of the shell and 

 the anterior half of the ventral margin of the shell; it has no spine-like process on the rostrum. 

 It is finely serrulated along the posterior half of the ventral margin of the shell and the posterior 

 margin of the shell. The compound glands are of the type described by G. W. Muller. The 

 glands along the posterior margin of the shell are comparatively weakly developed; their exits 

 are of about the type described above for C. oblonga. There is a rather well developed oval 

 hinge-socket and hinge-tooth at the posterior dorsal corner of the shell. 



First antenna (fig. 3): — This is of about the type described and reproduced 

 by G. W. Muller. The retinaculum of the second joint was bare in the specimens investigated 

 by me; in G. W. Mt'LLER's pi. XXIII, fig. 22 this bristle has short hairs. According to G. W. 

 MtiLLER the ,,Nebenborsten" are ,,nicht behaart"; in the specimens investigated by me these 

 bristles were furnished with a larger or smaller number of short, fine, distally pointing hairs 

 about opposite to the distal part of the row of spines on the e-bristle; these hairs were 



