58 DR. R. V. WILLEMOES-SUHM ON SOME ATLANTIC 



Fig. 12. Fourth pereiopod "1 



Fig. 13. Fifth pereiopocl >of the same. 



Fig. 14. Anterior pleopod J 



Plate IX. 



1. Gnathophausia gracilis, male, x 4 nat. size, 

 g. 2. Second antenna of Gn. zoea : al, appendix lamellaris ; fu, funiculus ; fl, flagellnm. 

 g. 3. Mandibula of the same ; p, palpus. 



4. Labium of the same. 



5. First maxilla of the same, higher power ; p, palpus maxilla?. 



g. 6. Second maxilla of the same : fl, flagellum ; p, palpus ; o, accessory eye. 



g. 7. Maxilliped of the same : fl, flagellum. 



8. First 1 



„ , > gnathopod of the same. 



Figs. 10-14. The five pereiopoda of the same. 

 g. 15. One of the anterior pleopoda of the sa/ne. 

 g. 16. Maxilliped of Gn. gigas : fl, flagellum; p, palpus, 

 g. 17. Outlines of the eye of the same. 



Plate X. 

 Fig. 1. Astacus zaleucus, male, nat. size 



Fig. 1 a. One of its right pleopoda. 



Fig. 2. Gnathophausia gigas, male, nat. size. 



Fig. 2a. The same, side view (the carapace is lifted somewhat to show that it is not connected with the 

 pereion), nat. size. 



Fig. 3. Oral apparatus of the same: /, labrum ; md, mandibula; mp, palpus mandibulse; p, palpus of the 

 second maxilla; fl, its flagellum; ac, accessory eyes on the second maxilla; basal joint of 

 the maxilliped with its palpus (the other joints of m have not been drawn, in order not to 

 confuse the figure) ; x and y, plates formed by the flattened inferior borders of the carapace. 



Fig. 4. Gnathophausia zoea, male, x 4 nat. size. 



Plate XL 



Fig. 1. Zoea of Cardisoma, sp. ? from San Jago (Cape-Verd Islands). High power, a 1 , first, a 2 , second 



antenna ; m, parts of the mouth ; gp, the gnathopoda. 

 Fig. 2. Caudal fin of the same, seen from above. High power. 

 Fig. 3. A string of eggs and egg-capsules, partly containing zoeas, partly left by them. Taken from 



the abdominal feet of the mother. Low power. 

 Fig. 4. Cijstisoma neptunus [Thaumops pellucida) , male. Nat. size. 

 Fig. 5. Genital organs of a smaller male : A, segments of the pereion; B, first segment of the pleon ; 



t, testes ; vd, vasa deferentia ; ag, aperturse genitales. 

 Fig. 6. Mandibula of the same. High power. 

 Fig. 7. Maxilla of the same. 

 Pig. 8. Maxillipedes (m) and second maxilla, with (I) labium (?) of the same. 



Plate XII. 



Figs. 1-9 refer to Apseudes c<eca. 



Fig. 1. A female, x 4 nat. size : a, antenna; gn, gnathopoda. 



