266 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



powerful chela, which is almost spherical in shape, and to which is 

 attached the aesthetask. The fifth and sixth segments are also fused 

 into a curved, very stout, and bluntly pointed claw, which serves as 

 the dactylus of the chela. 



The first two pairs of legs are more slender than in the female; 

 both rami of the first legs are 2-segmented, but the distal exopod 

 segment is much longer than the basal. The proximal endopod seg- 

 ment is fringed with hair on its inner margin only and there are no 

 setae on the distal segment inside the base of the apical claw. In the 

 second legs the outer spines of the exopod segments are very slender, 

 the outer apical seta of the end segment is pectinate on both margins, 

 the inner seta is pectinate outwardly and plumose inwardly. The 

 distal segment of the second endopod has two apical setae, also pec- 

 tinate outwardly and plumose inwardly, and two short inner plumose 

 setae. 



The endopods of the third and fourth legs scarcely reach the tip 

 of the first exopod segment and each carries three apical setae. 

 The exopods are considerably enlarged and the end segments are 

 armed with coarse spines as is usual in this genus. The sexual 

 armature of the second and third endopods, so common in the males 

 of other species, is here entirely lacking. The basal segment of 

 the fifth leg has a very elongate outer process, but the inner expan- 

 sion is practically obsolete and without setae. The distal segment 

 is short, narrowed at its base, and armed with two long and equal 

 apical setae. There is also on either side of the ventral surface of 

 the genital segment a small lamina tipped with two unequal setae, 

 the rudiment of a sixth leg. 



Remarks. — The peculiar club feet constituting the fourth pair in 

 the female show conspicuously under low magnification and will 

 identify the species at once. It was very common in the sand 

 under 5 or 6 inches of water, and was found in company with the 

 species mohammied described on page 269. It is worthy of note that 

 the water in this French Watering Place is strictly fresh and has 

 no trace of salinity. 



LAOPHONTE MANIFERA, new species 



Plate 15 



Occurrence. — Both sexes were obtained in considerable abundance 

 in surface towings in Sengekontacket and Nashaquitsa Ponds, 

 Marthas Vineyard, August, 1926; in the Eel Pond at Woods Hole, 

 July, 1925; in Great Pond, Falmouth, July, 1925. Female holotype 

 from Sengekontacket Pond is U.S.N.M. No. 60341. 



Color. — Body transparent and whitish with no pigment marks; 

 eggs pale brown ; no eye visible. 



