NO. 1573. PARASITIC COPEPODS— WILSON. 407 



Adhesion pads similar to tliose in the female, but smaller, the pair 

 on the margins of the lateral lobes of the second thorax segment 

 especially well developed. 



Second maxill?e peculiar in being bent outward away from the 

 base of the mouth tube nearly in a half circle. Kjoyer, in speaking 

 of these appendages, says that they are small and indistinct, so that 

 he could not make them out with certainty. He therefore refrains 

 from describing them, but Steenstrup and Liitken show them in 

 their figure of the ventral surface of this species. This figure, how- 

 ever, is very small and can not show details, and all they say of these 

 appendages in the text is simply that they are of the usual form. 

 Fig. 133 gives the details of their structure, and it can be seen that 

 they consist of an enlarged basal joint, and a slender terminal spine 

 pointed away from the mouth tube. First maxillipeds rather small 

 and slender; terminal claw on the second pair also slender but long, 

 the interval between the base of the claw and the immovable knobs 

 being very wide. 



The spines and setae on the swimming legs are arranged as follows : 

 First exopod, 1, 0; 4, III: endopod, 0, 0; 0, III: second endopod, 

 1, I; 4, VI: endopod, 0, I; 0, YIII: third exopod, 1, I; 3, IV: 

 endopod, 0, I; 0, VI: fourth exopod, 3, I; 4,V: endopod, 0,1; 0,V. 



Total length, 9.6 mm. Length of carapace on mid-line, 3.2 mm. 

 Width of same, 4.8 mm. Length of three free segments, 2.4 mm.; of 

 genital segment, 2.2 mm.; of abdomen, L6 mm. 



Steenstrup and Ltitken give their largest specimen as 11 mm. long; 

 Kroyer states that of the four specimens examined by hmi the largest 

 was over four lines (9 mm.), the two next in size a little over three 

 lines (6.75 mm.), while the fourth was smaller. Color a uniform j^el- 

 lowish horn color, transparent in living specimens, and often nearly 

 so in preserved material. 



{crancMi, a proper name, see below.) 



In 1892 Van Beneden published a description with figures of a 

 Nogaus which he claimed to be the male of the present species. For a 

 discussion of tliis form, see page 450. 



Again, in 1899 Bassett-Smith suggested that Heller's Nogagus 

 elongatus was the male of Pandarus dentatus, the latter being one of 

 the synonyms of the present species. This Nogaus will be found 

 discussed on page 451. 



The true male described above was the type on which Leach 

 founded in 1819 his new genus Nogaus. The genus itself is discussed 

 elsewhere (p. 439). We msh to note here only the description which 

 he gave of this type species: 



Nogaus latreillii. Couleur pale, sans tache. Decouverte par Cranch, latitude sud, 1 ; 

 longitude, est, 4; meridien de Londres (p. 535). 



