studies on marine Ostracods 



725 



Mandible (see the appended fig. 22) : — P r o t o p o d i t e: Coxale (see the appended 

 fig. 15): The toothed edge of the pars incisiva has about ten teeth (see the appended fig. 16). 

 Distal tooth-list: This is of the same type as is described above for C. oblonga and has from 

 about twelve to sixteen teeth (see the appended fig. 17). Proximal tooth-list: This is rather 

 slightly narrower than 

 the distal one and varies 

 somewhat in type. It 

 consists of about 10 to 

 25 irregularly arranged 

 smooth conical teeth 

 which vary in size and 

 strength; some of the 

 posterior ones are al- 

 most as large as the two 

 posterior ones on the 

 distal tooth Ust; see the 

 accompanying fig. 18. 

 On the inside this list 

 is furnished with fine, 

 short spines, situated 

 close together. The 

 masticatory pad is 

 rather narrow and high, 

 somewhat more thanhalf 

 the width of the tooth- 

 lists, and is divided 

 into four or five trans- 

 verse ridges; it is armed 

 with short, fine papillae, 

 placed close together. 



The part that is surrounded by the row of bristles and hairs is raised somewhat like a 

 pad and is also furnished with short, fine papillae, placed close together. Basale: The six 

 teeth on the distal edge of the endite are furnished with rather fine serrulation (see the appended 

 figs. 19 and 20). The single tooth on the outside of this process is of about the type reproduced 

 in the figure just mentioned. The e p i p o d i a 1 a p \) e n d a g e consists of a moderately 

 large verruca with a moderately long bristle; see the appended fig. 21. E n d o p o d i t e: The 

 first joint has four bristles on the posterior side; one of these is situated somewhat laterally 

 and is about as long as this brancli. The three others are situated more or less medially and are 

 about half the length of the former bristle or a little shorter or longer; one of these three bristles 

 usually has long hairs, the others have short hairs. Pilosity: Tlie basale is furnisiied medio- 

 ventrally with moderately long and rather sparse hairs. 



Fig. CXUI. — Conchoecia symmetrica G. VV. Muller, (J. — 27. Left fifth limb seen 



from outside; 114 X. 28. Distal part of the middle end claw of this limb; 9:i8 X. 



(From a specimen from station 64 b.) 



