RECENT BRITISH OSTRACODA. 



407 



o 



re, subovate, widest in the middle ; greatest width equal to a little more than half th 

 th. End view ovate, width equal to three-fourths of the height. Notch, as seei 



from below, elliptical, seen from the front arcuate. Shell covered densely with 

 pubescent hairs; colour yellowish white. Second joint of the upper antenna; ab 

 Ion 01 as the following four united; secondary branch of the inferior antennae very 



the last joint elongate- ovate, bearing two setae on its anterior margin, and one, which is 

 curved upwards, on the truncate extremity. Last joint of the mandibular loot armed 

 with three claws, the anterior of which is short, the other two subequal. and nearly twici 

 as long; second joint bearing at its apex a large subcorneal process, winch is armed at 

 the extremity with two moderately long plumose setae; oviferous feet bearing about 

 twenty-four apical seta;, each of which has 4-6 series of short teeth; extremity hooked 

 at one side. Postabdominal plates having 8-10 dentate claws. "Mak similar to the 

 female, but rather smaller, the eyes larger and redder; secondary branch of the lower 

 antenna; three-jointed, last joint elongated, membranaceous, terminating in two short 

 setae. 



j» 



Length -A in. 



■»"" 12 



miles off Tvnemonth, on a muddy bottom (Rev. A. M. Xorm„„ ; " drodfi 



M 



I have not had the opportunity of examining the type specimens of this spec* ; but 

 as I believe Dr. Baird considers them to he identical with B. globom*. I have hew 



adopted that view. . , , ,, 



The following interesting remarks on this species I translate from Sars s work on tbe 

 Norwegian Ostracoda. The difference noticed by that author between the , wo forms 

 (probably male and female) have an important bearing on those J**"™ m. ■ f 

 found in Cylindroleleris Marite. In the latter species, however, the - - > 



J ^ *± ^f i+c slow movements inicl inconspi- 



principally in the upper antenna, "On accoun o ^JS^ am0 „, st „, ,„'„,, 



cuous colour, this species [*. global] - somewha d When It o * £ ^ 



m which it constantly seems to live, and with which its shell on 



I have mostly found L set. of the lowex^ ^^Z^^^^ 

 very short, decreasing in length towards the apex and ^np ^ 



vidual, which in other respects agreed with the rest I found *™ fm |wimmSng< 



seta, attached to the last five joints being much **£«£* J imens which i had 

 My attention was first drawn to this as follows • JjJJ^J ^^ al(an(lon its , ow 

 * a glass of sea-water, I saw, to my surprise, one mc f ^ ^ ^^ 



creeping movement, which, from the structure ot tie io ^^ ^ a ghort bound 



possible for this genus, and, with a peculiar rolling ^>^ j ^^ ^ ^ 



upwards from the bottom of the glass. On examination ^ ^^ ^ ^ peculiarity. 

 Wer antennse were armed with long swimming-set av^ ^ ^ ^ fi ^ ^ |urmise 

 I thought that the specimen might possibly be a A BdlM0B g^ m y preserved spe* 

 Wne out by anatomical examination. I have since convil " m i myself that tin M 



cimens many individuals thus fitted for swimming, an ^ ^ ^ ^^ for j havr 



*ith the short seta3 are females. The peculiarity is ft ^ ^ anoth<T spec j r * 



f ound it in both young and old individuals ; and 1 Have ^ r % 



