164 



maxillae are normal, with a large, thick basal joint; the raaxillipeds are4-jointed; the genital 

 area is plate-shaped. The male is known only in one of the two first mentioned species, 

 but it differs widely from all the other males known of the family. Of the species (S. Mun- 

 nopsidis), the female of which deviates most from the species found in Amphipoda, I have 

 found scarcely quite developed larvae, which in the structure of antenna? and maxillae come 

 close to the species of the genus which live in Cumacea, but they differ from these parasites 

 in having the second joint of the maxillipeds much longer than the third, whereas the 

 fourth joint is armed with three spiniform processes on the distal part of the inner margin 

 The larva of the two other species, unfortunately, is unknown. So the knowledge of this 

 little group is rather defective. 



Conspectus of the Females. 



1. The head distinctly defined from the trunk, frontal and lateral borders well developed. 

 Genital apertures oblique and close together ; 2 



1 '. The head not defined from the trunk, no frontal or lateral borders. Genital apertures 

 transverse, comparatively far from each other 34. S. Munnopsidis n. sp. 



2. The genital area is a very large plate, only a little broader than long, and the longest 

 dimension of the muscles of the genital apertures is shorter than the distance from 

 their outermost extremity to the margin of the plate 32. S. curtipes n. sp. 



2'. The genital area is a large plate, considerably broader than long, and the muscles of 

 the genital apertures are a good deal longer than the distance of their outermost 

 extremity from the margin of the plate 33. S. af finis n. sp. 



32. Sphaeronella curtipes n. sp. 



(PI. X, fig.2a-2g). 



FEMALE. The only specimen found (fig. 2a) is 2 - 4 mm. long, 2-2 mm. broad and 

 considerably flattened; anteriorly the body tapers a little. The head is well defined, but 

 very small, and especially very short, nearly twice as broad as long (fig. 2d). The slightly 

 curved frontal margin is furnished in its whole length with excessively short hairs. An- 

 tennulae of about medium length, 3-jointed, the terminal setae somewhat shorter than the 

 antennula. Antennae not found. Mouth very large, with extremely broad month-border. 

 The maxillulae have tolerably long and powerful principal branches and a good-sized additional 

 branch. Maxillae very large, the basal joint long and very thick, smooth. Basal joint of 

 the maxillipeds long and slender, bearing a few short hairs at the distal end, otherwise 

 naked; the three other joints slender, and the last joint provided with a single spine a 

 little inside its pointed end. The sub-median skeleton has a broad list inside the maxillae, 



