190 DR. W. T. CALMAN ON THE MACRUROUS [Mar. 6, 



what position tlae present forms ought to occvipy within this 

 group ; and even if that question were satisfactorily answered, there 

 would still remain room for discussion as to the appropriate name 

 to be applied to them. It is generally agreed that Milne-Edwards's 

 longirostris, described as coming from Algiers, but not since found 

 there, is identical with the earlier nilotica desci'ibed by Roux 

 from the Nile. From de Man's re-examination of Milne-Edwards's 

 types, we know that it has the carpus of the first chelipeds one 

 and a half times as long as broad. From this Dr. de Man 

 separates as a distinct species, under the name G. tvyclcii Hickson, 

 those forms which have the first carpus at least twice as long at 

 broad. Prof. Bouvier (Bull. Sci. France et Belgique, xxxix. p. 79, 

 1905) has pointed out, however, and I can confirm the statemens, 

 that co-types of Prof. Hickson 's species, from Celebes, have the 

 carpus exactly as in the types of longirostris. Specimens received 

 from Prof. Hickson, and preserved in the British Museum, agree 

 very closely indeed with de Man's description of his C. nilotica, 

 var. minahassce (also from Celebes), difiering chiefly in the shorter 

 dactylus of the posterior perseopods, that of the fourth pair being- 

 less than one-fifth, and that of the fifth pair one-fourth of the 

 corresponding propodus. It follows that, so far as the characters 

 of the carpal segments are concerned, C. tmjckii Hickson must be 

 regarded as a synonym of C. nilotica Roux, while C. wyckii 

 de Man, if it is to be regarded as distinct, must receive a new 

 specific or varietal name. Prof. Bouvier appears to regard 

 de Man's species as merely a variety of that of Roux and Milne- 

 Edwards {t. c, table on p. 73 ; on p. 79, however, he treats it 

 as a separate species); and in this I am disposed to concur, 

 although the matei^ial at my disposal is too scanty to enable 

 me to form a definite opinion. At all events the specimens 

 collected by Dr. Cunnington in Lake ISTyasa and in Victoria 

 Nyanza, while not agreeing exactly with each other or with any 

 of the described forms, come sufficiently near to the variety 

 gracilipes, which de Man places under the species loyckii, and 

 Bouvier under nilotica ; and I therefore record them under the 

 latter name. The following particulars were found to agree in 

 several specimens from each locality, ovigerous females being 

 compared in each case : — 



Nyasa. — Total length up to 21 mm. Rostrum reaching beyond 

 antennal scale, teeth "^^^g"" ^, unarmed terminal part of upper 

 edge much less than half its length ; one or two sub-apical teeth, 

 and, occasionally, an isolated tooth a little way back from the tip. 

 Carpus of first perteopods two and a half times as long as broad, 

 that of second pair more than five times as long as broad. Dac- 

 tylus of fourth pair one-fifth of propodus or a little over, bearing 

 7-9 spines ; that of fifth pair a little more than one-fourth of 

 propodus, with about 33-38 spines. Eggs '47 X '27 mm. 



Yictoria Nyanza. — Total length up to 25 mm. Rostrum, except 

 in one or two cases, reaching beyond antennal scale, teeth ""1" ~^^ > 



