studies OH marine Ostracods 305 



The bristles of the third and fourth joints and the middle one of the three bristles on the end 



joint are, in addition, furnished, the two former ventrally, the latter dorsally, with a series 



of very coarse, strong, smooth spines, somewhat blunted and rounded distally (the species has 



obtained its name from this character); the number of spines on each bristle seems to vary, 



from twelve to eighteen have been observed; they are so placed that when the natatory bristles 



are situated closely along each other a single row of spines is formed, in other words, the spines 



on the bristle of the fourth joint are situated so as to form a direct continuation of those of the 



preceding bristle and the spines on the bristle of the end joint are a continuation of those of 



the bristle on the fourth joint; the row of spines on the bristle of the third joint begins a rather 



long distance from the base of the bristle, the unarmed proximal part of this bristle corresponding 



in length to about the total length of the five or six distal joints. (This unarmed part is protected 



by the strong bristle of the second joint). The end joint has only three bristles, of which the 



two ventral ones are developed in the same proportions as the natatory bristles of the 



preceding joints; the dorsal one, which also has long, well-developed natatory hairs, situated 



close together, is about as long as the total length of the eight distal joints. The four distal 



joints have powerful basal spines; the basal spines on the third to the fifth joints are, on the 



other hand, very small, especially those on the third and fourth joints, which can only be observed 



with difficulty. Endopodite (fig. 10): This is short and verruciform, with only an indication of 



having two joints. Proximally it has three bristles of somewhat different lengths, the longest 



being comparatively long, more than double the length of the shortest and about as long as the 



total length of the four distal exopodite joints; they all have short hairs or are almost naked. 



Mandible (fig. 11): — P r o t o p o d i t e : The endite on the coxale has a rather 



moderate number of spines. It is — as has been pointed out above — ■ weakly bifurcated 



distally, the two distal points are considerably stronger than the spines and are almost quite 



bare; between these two points there is a verruciform process. The basale has seven bristles 



ventrally: three a-bristles, one b-bristle, two c-bristles and one d-bristle. Of these the a-, b- 



and c-bristles are short, the b-bristle being even rather difficult to distinguish, the d-bristle 



is about as long as the second endopodite joint. At the base of this last bristle there is no short 



bristle, contrary to what is the case in all the other species of this sub-family that are dealt 



with in this work. Of the three bristles on the dorsal side the proximal one is fixed at or just 



behind the middle of the joint and is quite short, being only about a fifth to a quarter of the 



length of the dorsal side of this joint; the two distal bristles are similarly rather short, one being 



about as long as the dorsal side of the first endopodite joint, the other twice as long; all these 



three bristles have short hairs. The exopodite is a good deal shorter than the dorsal side 



of the first endopodite joint; both its two bristles have short hairs or are almost bare; the longest, 



the proximal one, is about as long as the longest distal bristle situated dorsally on the second 



protopodite joint, the distal one is short, about as long as the exopodite. Endopodite: 



Of the four ventral bristles on the first joint the longest one, which is not quite as long as the 



posterior side of the second endopodite joint, has numerous long secondary bristles arranged 



in irregular wreaths, and has short hairs distally; the other three have short hairs. Second 



joint: This has rather few bristles on the anterior side; these are concentrated on the proximal 



Zoolog. bidrng, t'rpsahi. Suppl.-Bd. I. >59 



