A REVIEW OF THE MYSIDACEA 153 



Distribution. — This species is widely distributed in the tropical 

 waters of the Indian and Pacific Oceans and is apparently a surface 

 form, or at any rate it is found in the upper strata of water. 



Remarks. — I am still of the opinion that D. zimmeri and D. tatter- 

 sallii are not separable from D. pelagica and D. quadrispinosa by any 

 characters that can be regarded as of specific value. 



DOXOMYSIS MICROPS Colosi 



Synonymy and distribution records are given on page 246. 



Genus BATHYMYSIS Tattersall 



Bathymysis Tatteksall, 1907, p. 116. 



The discovery of a new species of this genus necessitates a modifi- 

 cation of the original description of the eyes. The new species has 

 large well-developed eyes with normal visual functional elements, 

 correlated with the fact that it is found in much shallower water 

 than the type, B. helgae. The diagnosis of the genus should there- 

 fore be amended to read: "Eyes large and normally developed with 

 definite eyestalks and normal visual elements, or small, set close 

 together, apparently without definite eyestalks, somewhat flattened 

 and subquadrangular in shape, visual elements imperfectly developed 

 and unpigmented in preserved specimens." The new species also has 

 a rostral projection absent in the type species. 



BATHYMYSIS RENOCULATA. new species 



Figures 57, 58 



Description. — Carapace covering all but the last thoracic somite; 

 produced in front into a well-developed, broadly triangular, bluntly 

 pointed rostal plate (fig. 57, a), extending not quite halfway along 

 the first joint of the antennular peduncle; anterolateral corners 

 rounded. 



Eyes (fig. 57, a) very large, reniform, and somewhat compressed 

 dorsoventrally, as long as the first joint of the antennular peduncle, 

 in dorsal view one and a half times as long as broad, visual area very 

 extensive both dorsally and ventrally, pigment golden brown. 



Antennular peduncle (fig. 57, a) with the first joint longer than 

 the combined length of the remaining two. 



Antennal scale (figs. 57, a, b) extending forward slightly beyond 

 the distal end of the antennular peduncle, in the male as far forward 

 as the distal end of the setose lobe, narrowly lanceolate, seven and a 

 half times as long as broad, with a small well-marked distal joint, 

 two spines on the basal joint from which the scale arises, one at the 



