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Coiichoecia hcttacra G. W. Miu.iCR. 



Conchm-cia hvUacrn. C W . Miiiij;, l'.i(Mi;i, y. li'h pi. XXIX. lios. 11—1!). 



,, 1900 c, ]i. 4. 



1908, p. 7S. 

 1<)1'2. i>. <fJ. 



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Description: — See (J. W. MtJLLEU, l<.»0();i, \>. 121. 



Supflementary description: — M a 1 o : — 



Shell: — Length: According to G. W. MCller 1,9 mm. .,Gr6Bo zicmlicli konstant". 

 Tho spi'oinions investigated by me measured 1,8 — 1,9 mm. l^ength : height about 2:1; length : 

 breadth about 2,1 : 1. Seen from t li e side it is of about the type reproduced bv 

 Vi. \\. MCllkh. 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 evenly curved, but liave a rather marked sinuation just behind 

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

 posteriorly. The shoulder vault is rather well developed, with a somewhat sharp edge or 

 rounded. The surface of the shell is bare and its sculpture is of the type des(;ribed 

 by G. W. MUller. Seen from inside: Selvage: This is smooth on the rostrum just 

 as it is along the anterior margin of the shell and the anterioi- lialf 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 (c? = ?). The compound glands are as described by G. W. MdLLER. 

 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 (<j' = $). 



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

 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 distally. The equipment of the b- and d-bristles agrees with 

 that stated by G. A\". Mi i.i.ki; ; 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: — Protopodite: Length about 0,9 mm. Exopodite: 

 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 branch is about 5 : 3. The armature of the first joint is about the same as in 



