196 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



This is the first indication that the species may be more widely dis- 

 tributed along the west coast of Mexico and Central America, from the 

 Gulf of California at least as far south as Guatemala. As a result of its 

 subterranean mode of life, the capture of any specimens not specifically 

 sought for in Balanoglossus burrows must be very accidental. 



Color: Coutiere remarked that this Lysiosquilla was especially note- 

 worthy because of the conspicuous similarity of its coloration to that 

 of its co-commensal [Lepidasthenia], above whose elongated body it 

 moves about in the Balanoglossus burrow in which it lives. The spots of 

 pigment on the carapace, and particularly those of the 5th abdominal 

 segment, imitate with great fidelity the elytrae of the polynoid in 

 question. 



Size: The type is 30 mm. long from the tip of the median rostral 

 projection to the posterior extremity of the telson and is so far the largest 

 known specimen. The broken male specimen from Puerto Escondido is a 

 little over 20 mm. in length, rostral plate 1.1, carapace 3, abdomen and 

 telson together 16.2 mm.; the female from Guatemala is veiy little larger 

 than the juvenile male, yet the adult characters seem to be fully devel- 

 oped; it measures 23 mm. long, rostral plate 1.4, carapace 4, abdomen 

 15.7, telson 2. 



Remarks: The female is very like the type in all particulars, and 

 seems to differ from it only in certain minor details. All spines are sharper 

 and more slender, especially those on the telson; also those arming the 

 posterolateral angles of the 6th somite and the 3 rostral ones. The spines 

 of the row of 5 spines across the dorsum of the telson above the posterior 

 margin are more or less subequal ; the median spine and those at either end 

 of the row are about equal in size and a little stronger than the pair inter- 

 posed between the outermost and median spines. There are 5 submedian 

 denticles, or rather spinules, either side of the median line; of these 10 

 spinules, the median pair is less than half the size of the next adjacent 

 pair. In the type of the species there are 3 submedian spinules either side 

 of the median line, and the median pair, as figured, appears subequal in 

 size to the next adjacent pair. 



The dactyl of the left raptorial claw is armed with 7 spines including 

 the terminal one, the right 6, whereas in Coutiere 's type, including the 

 terminal spine, both right and left raptorial dactylus is armed with 8 

 spines. 



The coloration of this specimen approximates that of the type very 

 closely. The rostral plate and eyestalks are darker, being more thickly 



