7.-K) TVOE sKOCsr.Rnr; 



Conchoecia hettacra G. W. MOller. 



Conchoecid hettacra. (i. W. MOl.LKH, 1906 a, p. 121; j)!. XXIX, figs. 11—19. 

 „ „ „ 1906 c, p. 4. 



„ „ „ 1908, p. 78. 



191'2 1) '»•> 



Descriftion: — Soe C!. W. MljLLKH, 1906 a, p. 121. 



Supplementary descfription: — M a 1 e : — 



Shell: — Length: According to G. W. Mtil.LEP> 1,9 mm. ,,GroBe ziemlich konstant". 

 The specimens investigated by me measured 1,8 — 1,9 mm. Length : height about 2:1; length : 

 l)readtli about 2,1 : 1. Seen from the side it is of about the type reproduced by 

 (!. \\. MtiLLEli. Seen from below (see the appended fig. 1) it has its greatest width 

 at or just in front of the middle and the anterior part rather considerably larger than the posterior 

 part. The side contours are evenl)' ciuved, but have a rather marked sinuation just behind 

 the middle. It is broadly rounded anteriorly with a symmetrical rostrum and is pointed 

 posteriori)-. The shoulder vault is rather well developed, with a somewhat sharp edge or 

 rounded. The surf a c e of the shell is bare and its sculptiu'e is of the type described 

 by G. W. MULLEH. Seen from inside: Selvage: This is smooth on the rostrum ju.st 

 as it is along the anterior margin of the shell and the anterior half of the ventral margin of the 

 shell; there is no spine-like process on the rostrum. Along the posterior half of the ventral margin 

 it is finely serrulated, along the posterior margin of the shell it has coarse, irregular serrulation; 

 see the appended fig. 5 (o = $). The compound glands are as described by G. W. MUller. 

 The medial glands along the posterior margin of the shell are of about the same type as is de- 

 scribed for C.oblonga on p. 618 above, but some of them are joined by a rather distinct list. At 

 the posterior dorsal corner there is a well developed, elongated hinge-socket and hinge-tooth; 

 see the appended fig. 4 (,^ = $). 



Firs t a n t e n n a : — This is of the t;ype described and reproduced by G. W. MtJLLER. 

 E-bristle: This has a double row of five or six ,,stempelartigen Zapfen"; these ,,Zapfen" are 

 of about the same type as is shown on p. 699 above for C . spinirostris ; see the appended fig. 6. 

 Along the proximal half this bristle has on its anterior side a moderate number of rather 

 short hairs; it is narrow distaUy. The equipment of the b- and d-bristles agrees with 

 that stated by G. W. MULLER ; these bristles are narrow distally and have no pad-like appendages. 

 The a-bristle has an accessory saccule. All the joints are quite bare. 



Second antenna: — P r o t o p o d i t e : Length about 0,9 mm. E x o p o d i t e : 

 The proportion between the length of this branch and that of the protopodite is about 16 — 17 : 30, 

 The proportion between the length of the first joint and the total length of the eight following 

 joints is about 10 : 4. The proportion between the length of the longest natatory bristles and 

 that of this l)ran(li is about 5 : 3. The armature of the first joint is about the same as in 



