A REVIEW OF THE MYSIDACEA 93 



Occurrence. — The Albatross collected material from several Philip- 

 pine localities : Nasugbu Bay Anchorage, electric light, surface, 7 : 30 

 p. m., January 21, 1908, 11 males, 2 females; Pasacao Anchorage, 

 Ragay Gulf, Luzon, electric light, surface, 7 males, March 8, 1909, 3 

 males ; Cabugao Bay, Catanduanes Island, Luzon, electric light, sur- 

 face, 7 p. m., June 9, 1909, several hundreds of both sexes ; Nato An- 

 chorage, Lagonoy Gulf, Luzon, electric light, surface, 8 p. m., June 18, 

 1909, 58 males, 13 females, breeding (type lot) ; Talisse Island, north 

 of Celebes, electric light, surface, November 8, 1909, 4 females, 2 males. 



Distribution. — Known only from the waters around the Philippine 

 Islands. 



Remarks. — This species is closely allied to G. indicus, G. paciftcus, 

 and G. parvus, but it may be distinguished by the form of the male 

 pleopods, especially that of the second and third pairs. 



GASTROSACCUS JOHNSONI Tattersall 



Figures 26-28 



Gastrosaccus johnsoni Tattebsall, 1937, p. 9, figs. 5-7. 



Description. — Carapace (fig. 26, a) produced in front into a short 

 triangular rostral plate with a subacute apex ; dorsal posterior margin 

 (fig. 26, b) of the carapace with a median triangular lobe and a broad 

 rectangular lobe on each side of it, none of the lobes reflexed. 



Eyes small (fig. 26, a) , including the eyestalks twice as long as broad, 

 cornea occupying the distal third of the whole eye and wider than 

 long. 



Antennular peduncle (fig. 26, a) with the first joint equal to the 

 combined length of the second and third ; two spines on the outer mar- 

 gin of the second joint and a similar spine near the distal end of the 

 outer margin of the third joint. 



Antennal peduncle (fig. 26, a) extending forward to the level of the 

 distal end of the second joint of the antennular peduncle. 



Antennal scale (fig. 26, a) shorter than the first two joints of the 

 antennular peduncle, about three and a half times as long as broad, 

 terminal joint marked off by a distinct suture. 



Mouth parts and thoracic limbs essentially as in G. sanctus; carpo- 

 propodus of the endopod of the third to the eighth thoracic limbs 

 (fig. 27, f-g) divided into 7 to 12 subjoints, dactylus very reduced; 

 basal plate of the exopod of the first thoracic limb with the outer 

 corner rounded, those of the remaining limbs with a distinct tooth at 

 the outer corner. 



Uropods (fig. 28, b) with 13 spines on the outer margin of the exopod 

 and 2 spines on the inner margin of the endopod. 



