studies on marine Ostracods 491 



Habitat: — Coast of England: Salcombe. English Channel (t y p c - 1 o c a- 

 lity): one mature female and one larva (coll. G. B. Bl^ADY); R. M. 8., on slides. Medi- 

 terranean Sea: Naples: one mature female (coll. C W. Ml'LUoii); on slides, R. M. S. 



Asterope Miilleri n. sp. var. longiseta n. var. 



Description: — Female: — 



Shell: — Length, 1,62 — 1,66 mm.; length : height about 1,4:1, lenght : breadth 

 about 1,9 : 1. Seen both from the side and f r o m be I o w (figs. 1 and 2) it is 

 of quite the same type as the shell of A. Miilleri. Seen fro m within: Medial bristles: 

 These also show a great resemblance to those of the type species; it is to be noted, however, 

 that the rather few bristles in the incisur are scattered and the row of bristles between the spine- 

 bearing list and the posterior margin of the shell is eitlier only developed along the ventral 

 half of the spine-bearing list or else — and this seems to be the most common case — it is 

 represented dorsally by single bristles (cf. fig. 3). The spine-bearing list has about 31 — 32 hyaline 

 spines which vary somewhat in size; its bristles are like those of A. Miilleri; two bristles were 

 very seldom found between a pair of hyaline spines. As in A. Miilleri there are no broad pores 

 between the list and the posterior margin of the shell. 



First antenna: — This is very like this limb in A. Miilleri. It is to be 

 noted: The third and fourth joints form together an almost quadratic joint, only rather 

 slightly shorter than it is high and somewhat shorter than the total length of the fifth and 

 sixth joints. The distal boundary of the fourth joint is moderately concave. The longer of the 

 two postero- distal bristles on the fourth joint is shorter than the total length of the fifth and 

 sixth joints. The c-bristle has five, the f-bristle has four or five and the g-bristle five or 

 six sensorial filaments. 



Second antenna: — Distally on the inside close to the exopodite the p r o t o- 

 p o d i t e has a very short bristle. The end joint of the exopodite has four bristles. The 

 fourth to the ninth, sometimes the third to the ninth, joints of this branch have basal spines. 

 The endopodite (fig. 4) is very small, almost quite unjointed; its distal bristle is more 

 than twice, sometimes as much as three times, as long as the stem. 



Mandible: — This is very like the corresponding limb in A. Mulleri. We must 

 note: Protopodite: Coxale: The scythe-shaped process (fig. 5) has six ventral spines, 

 all with double points, the distal ones rather weak. Sometimes, when the fine points are worn 

 off on the four distal spines, the latter are only represented by weak, rounded swellings as in 

 A. Miilleri. Basale: The backward pointing process has four distal bristles, four triaena 

 bristles and one dwarf bristle. On the triaena bristles from three to five pairs of spines were 

 observed under the distal pair of spines. The glands of this process emerge on a peg which is 

 almost as large as in fig. 9 of A. spinijera. The dorsal side of this joint is either smooth or is 

 furnished with a few groups of short, fine, stiff hairs. Endopodite: The second joint has 

 one proximal bristle, which is about a third of the length of the main bristle a. The medial 



