Studii's on niaiiiie Oslracods 73i) 



Conchoecia Valdiviae G. W. MOller. 



Conchoecia Valdiviae, G. W.Mi'Ll.EH, 19U6 a, p. 123; pi. \. fitr. 1; pi. XXIII. figs. 8. 10— Ifl. 



.... „ 1908, p. 19. 



.. „ „ 1912, p. 93. 



Description: — See G. W. MCller, 1906 a, p. 123. 



Swpflementary description: — Female: — 



Shell: — Length: According to G. W. MClleu „ziemhch konstant 5,5 mm.". The 

 specimen investigated by me was 5,4 mm. long. Length : height about 1,75 : 1; length : breadth 

 about 2,3 : 1. Seen from the side it is of about the type described and reproduced 

 by G. W. MtLLER; see the appended fig. 1. Seen from below (fig. 2) it is narrowly 

 oval, with its greatest width at about the middle and the anterior and posterior parts of about 

 equal size and of the same type; the side contours are evenly curved, the ends well rounded 

 and the rostrum symmetrical. The shoulder vault is rather weakly developed and well rounded. 

 The surface of the shell has a few scattered moderately long or short bristles. The sculpture 

 and the compound glands are the same as are described by G. \V. MUller. Seen from 

 inside: The glands along the posterior margin of the shell are about the same as are described 

 on p. 618 above for C. oblonga. The selvage is of the same type as is described for C. borealis 

 p. 709 above. At the posterior dorsal corner of the shell there is a well developed oblong 

 hinge-socket and hinge-tooth (of about the same type as is reproduced above for C. hettacra). 



First antenna (fig. 3) : — This has rather weak division into joints. The bristle 

 of the second joint is somewhat shorter than the capitulum of the rod-shaped organ and has 

 short hairs. The e-bristle is not sword-shaped distally; it is almost or quite bare proximallv 

 on the anterior side. All the joints are partly fm-nished with short, rather fine spines. 



Second antenna: — Protopodite: In the specimen investigated by me 

 this measured 2,2 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 11 — 12 : 20. The proportion between the length of the 

 first joint and the total length of the eight distal joints is about 10 : 4. The proportion between 

 the length of the longest natatory bristles and that of the exopodite is about 3 : 2. The first 

 joint has rather few spines proximo-dorsally. Endopodite: This has three joints. First 

 joint: The a- and b-bristles are bare or have only a few short hairs. The processus 

 mammiUaris has a small papilla distally. Second joint: The c- and d-bristles are developed 

 and are about the same size as is seen in pi. XXIII, fig. 8, G. W. MIjLLER, 1906 a. The g-bristle 

 is somewhat longer than the protopodite; the f-bristle is about a third shorter than the g-bristle; 

 both are furnished with short hairs and are not sword-shaped distally. End joint: 

 The h-, i- and j -bristles are subequal, somewliat less than half the length of the g-bristle, and 

 are about as thick proximally as the f-bristle; all of them have rather slight indications of shafts 

 and are moderately densely furnished with spines proximally. There is an extremely small 

 papilla between the h- and i-bristles. The second joint of the endopodite is bare. 



