79 



the form of a blunt tooth; the other is divided into several (six.O 

 finger-like curved processes, which are ciliated on the edges." 

 In the caudal laminae the stout ungues are seven in number in 

 the female specimen, but in the male they seem to be certainly 

 less numerous, though here, unfortunately, we have to judge no!t 

 from the spines themselves, but from the scars of their places of 

 insertion. The dififerences mentioned liave led me to give the 

 Irish specimen a distinctive name, Crossophonis impcrialis- 



In discussing the large lamina in the maxillipeds of Cypridina, 

 G. W. Miiller susf^ests that it represents the oalescenceof tw^o 

 joints, and to this view the apical lol)e of the lamina in Crosso- 

 phorus lends probability- 



Crossophorus africanus, Stebbing. 

 Plates 15A and 16. 



I90I. CrosopJioriis nfricanus, Stebbing, Knowledge, vol. 24, p. 

 1 00. 



Shell smooth, not very hard, surface diversified by oily-looking 

 little circles ; antennal notch not widely opened, reaching ito the 

 miaciie of the valve, the subacute rostral process fineily ciliated on 

 its lower margin. 



Of eyes, median ocellus, or frontal tentacle, I have not found 

 any trace_, nor is mention of them made under this genus by 

 PJrady or by Brady and Norman- The first antennse have the first 

 joint long and broad, the second narrower and not quite so long, 

 but longer than all the remaining joints together, more than 

 twice as long as the third, which is oblicjuely articulated with the 

 much shorter fourth ; the fifth has an annulated sensoiy seta, 

 carrying on one side a double series of branchlets, followed after 

 .a considerable interval by some very small ones at the distal Qi\\(\ : 

 on the two little terminal joints there are seven, mostly very un- 

 equal, setje, three of them very long. Brady and Norman in- 

 clude in their character of the genus antennules with second 

 joint only slightly longer than the third, but their figure shows 

 it considerably longer than the third and fourth joints combined- 



'ihe second antennae have the swimming branch divided 

 betweeti the long apically widened first joint and the eight follow- 

 ing joints, of which the first is considerably the longest, the first 

 seven each armed with one plumose seta attended by a short 

 spine, the terminal having seven such se^tse; the secondary 

 appendage in the female is straight, its middle joint the longest, 

 the third tapering. 



The mandibles have the strongly hirsute and sharply Itwo- 

 pointed masticatory process projecting from distal part of first 

 joint, with several spines adjoining on base of second, from inner 

 margin of which issues a long plumose seta, the outer margin 



