65 



considerably in thickness. In tlie female the sixth segment is also proportionately deeper than 

 in the other species. That the telson varies in shape is shown in figs. 4// and 4/, representing 

 that appendice in two males from the same station. In the male the exopod of the uropods is 

 observed in specimens from the same locality to vary from being four and a half times as long- 

 as broad, but generally it is only slightly or somewhat more than four times as long as broad; 

 the upper distal angle of the exopod reaches always beyond the end of the marginal tooth 

 which is small, and excepting in a few small specimens (fig. 4/) this tooth is placed much 

 (fig. 4.C) or very much (fig. 4^') in advance of the upper distal angle. In the female the exopod 

 is about four times as long as broad, and the marginal tooth is placed far before its end 

 (figs. 4t' and 4^'-). 



The petasma (figs. 4/ — 46') is rather similar to that in L. Faxoiiii. Its terminal portion 

 is proportionately shorter; its acute or subacute end less produced and it is not curved in the 

 opposite direction towards the end. The processus ventralis {pv. in figs. 4;/ and 4^/) has its distal 

 half shaped as a curved, acute needle differing somewhat in shape from that in L. Faxonii. 

 The protuberance on the front margin of the pleopod generally short {p. in figs. 4/ and 4;;/) 

 and very broad in proportion to its length, with several or many prickles. 



Length of a male 9 mm., of a large female 11.6 mm. 



Remarks. — Nobili's figures and his footnote on p. 27 (I.e.) are sufficient for 

 recognizing the species with certainty. As already pointed out in the description, it shows not 

 inconsiderable individual variation, and one curious point is not mentioned above. In the spe- 

 cimens from nearly all the "Siboga" stations the eyes are light opaque or brownish, but in the 

 hundreds of specimens from Stat 142 the eyes are internally partly or totally black, and the 

 same colour is also found in some specimens from Stat. 71, in numerous specimens from Colombo 

 gathered in 1898 and even in some specimens secured by the "Galathea" Expedition more 

 than seventy years ago. One is tempted to think that the difference in the colour of the eyes 

 might be a specific character, but in spite of a good deal of trouble I have been unable to 

 find any other character, not even in the petasma, and the variation found in other features 

 was independent of the colour of the eyes. 



Distribution. — The long- list of localities shows that L. Hanseni has been taken 

 at almost as many places in the "Siboga" area as L. penicillifer, but the number of specimens 

 of L. Hanseni is, taken as a whole, very much lower, probably not one-third as large as of 

 L. pcnlcillifcr. Nobili established L. Hanseni on specimens taken at Djibouti (the Red Sea), 

 and BoRRADAiLE records numerous specimens gathered in Melbourne harbour. The Copenhagen 

 Museum possesses specimens from Colombo, Ceylon (Mr. H. Mortensen); the Bay of Bengal 

 ("Galathea" Exp.); Lower India, and the Chinese Sea ("Galathea"). Consequently it has a very 

 wide distribution in the Indian Ocean and in at least a considerable part of the Pacific. 



