420 



DISCOVERY REPORTS 



which has the advantage of drawing special attention to the wide gap in our knowledge 

 of this species. 



Fig. 27. PamiUrus D, 13-7 mm. St. 1375. 

 a. Antennae. b. Maxilla, etc. c. Abdomen. 



Characters of the Phyllosoma of Jasvs lalandii. 



Fore-body as wide as or wider than long. Hind-body very much narrower than 

 fore-body, not hollowed behind. Abdomen narrow. 



Antenna slender, with long flagellum. 



Maxillipedes 2 and 3 without exopod, or with minute rudiment of it. Maxillule 

 without palp. Leg 5 closely apposed to abdomen, developing very early and without 

 exopod, or with minute rudiment of it. 



While the structure of the antennae and the form of the abdomen are those charac- 

 teristic of a genus of the Palinuridae, the absence of the exopod from maxillipede 3 is 

 remarkable. The exopod of maxillipede 2 always develops late and its loss, even in a 

 Palinurid, would not be surprising; but the absence of the exopod in maxillipede 3, 

 seeing that it is functional from the earliest stage in Palimirus and Pamiliriis, is most 

 unexpected. It is absent in all Scyllaridae known. 



Jasus lalandii (Lamarck) 



Stage VIII .? (Fig. 28). Length lo-ii mm. 



Carapace broader than long. Abdomen very small, parallel-sided, unsegmented, with 

 a small spinous process at each posterior angle. 



Eye-stalk longer than eye, eye and stalk together more than one-third of total body 

 length. Antennule with peduncle of three segments, segments 2 and 3 about equal, and 

 about half length of segment i ; endopod about one-fifth of exopod. Antenna with pe- 

 duncle indistinctly segmented, a small inner spine at position of end of segment 3. 



