ART. 5 



PAKASITIC CRUSTACEA OF WEST INDIES BOSCHMA 



9 



The testes are strongly curved, their extremity lies at a short dis- 

 tance from the vasa deferentia (in L. corculmn the closed end of the 

 testes lies much nearer to the mantle opening). The coUeteric 

 glands occupy about the central part of the lateral surfaces; they 

 contain a large number of tubes. 



The external cuticle of the mantle is rather thin, 8-12/t approxi- 

 mately. Its upper surface consists of small areas which have an irreg- 

 ular contour ; the diameter of these areas is about 9-12/x. In some of 

 the specimens of the material 



stalk- 



each of the cuticular areas bears 

 a small spine (fig. 6&) ; in other 

 specimens a much smaller num- 

 ber of these spines occurs, as 

 only about one-fourth of the 

 total number of areas has such 

 an excrescence (fig. 6a). These 

 spines are tapering from the 

 base to the top, which is evenly 

 rounded; they may attain a 

 length of 20)a and a thickness (at 

 the base) of 3/u,. In different 

 parts of the mantle of one speci- 

 men of L. panopaei the spines 

 may be of different sizes. (See 

 fig. 6c, d.) On the whole the 

 differences between the cuticular 

 excrescences of different speci- 

 mens (even those which live on 

 different hosts) are not more 

 striking than those found among 

 the spines of different parts of 

 the mantle of one specimen. 



The internal cuticle of the 

 mantle bears small retinacula 



(fig. 6, g-i) which consist of a very insignificant basal part and a 

 number (3 to 5) of spindle-shaped excrescences of 6-9ju, length. 

 Lateral barbs could not be detected on these spindles. 



The material of the United States National Museum contains 

 specimens of Loxothylacus panopaei on the following hosts : 



PaTiopeus occidentalis (Saussure) ; Porto Rico. 



Eurypanopeus depressus (Smith); Florida (?); Texas. 



Panope%LS herlstii Milne-Edwards ; Jamaica ; Cuba. 



dajkrens 

 left testis 



\\^l4t 

 ccllderic 

 qlcuid 



month 

 iifith 



c^y. 



mcsenicnj 



Fig. 5. — Loxothylacos panopaei (Gisslkb) 

 from eurypakopeus depressus (smith), 

 longitudinal section, x 30 



