534 RErORT ON THE ORDER STOMATOPODA—BIGELOW. vol.xvii. 



The eyes are very large and nearly T- shaped. The corneal part is 

 very prominent, is more than twice as long as the stalk, and is divided 

 into two parts by a slight groove. The anterior process of the ocular 

 segment is emarginate. The lateral processes are flat, broad, and 

 obtuse. The first antenna? are rather long, about the length of the last 

 five abdominal segments. The spines of the corresijonding segment are 

 short, straight, and acute. The second antennic reach a little beyond 

 the base of the tiagella of the first pair. The antennary scale is large. 

 The raptorial claw is strong. The dactylus has six long claws. The 

 pectinations on the manns are in a slightly undulating line. The (;arpus 

 has two or three short processes on the anterior edge. The appendages 

 to the thoracic appendages are linear. The inner spine of the basal 

 prolongation of the uropod is more than twice as long as the outer one, 

 and has a very small tooth on its outer side, about the middle of its 

 length, and the inner edge is serrated. The endopodite has its sides 

 nearly parallel. The terminal joint of the exopodite is nearly three- 

 fourths the length of the first joint. On the outer edge of this joint 

 there are eight to ten movaV)le spines, usually nine. In fully mature 

 specimens the difference between the sexes is very marked. In the 

 adult male, besides the thickening of the crest and the margins 4»f the 

 telson, the marginal carina? of the other abdominal somites are very 

 broad and thick, and each one is ccmnected along the posterior margin 

 of the somite with the lateral carina, which is a little broader than 

 in the female. The general shape of the abdomen differs in the two 

 sexes, the first, second, and third segments being much wider in the 

 male (pi. xxi). 



The young males in the collection (e. g., two 5.4 and 7.4 cm. long, 

 respectively) are in general like mature females, but differ in certain 

 peculiarities of the telson. The crest is sharp and ends in a prominent 

 spine. The marginal spines are relatively much larger than in the 

 adult. Between the submedian spines and the median sinus there are 

 next the spine two or three ordinary teeth, then for the rest of the dis- 

 tance to the sinus it appears as if the teeth were fused and their outer 

 edges produced into a number of very fine teeth. This is most marked 

 in the younger specimens. In a nearly full grown female the pair of 

 teeth next the sinus were found to possess similarly serrated borders. 



Color. — The alcoholic specimens have no characteristic coloring. 



Size. — The largest specimen is a male 17 cm. long. 



Locality. — The Albatross, in 1889, captured three large males, two 

 small ones, and two large females, in the Gulf of California, off La Paz 

 Harbor, at a depth of 112 fathoms (No. 18493, U.S.N.M.). The Alba- 

 tross expedition of 1891, under the direction of Dr. Alexander Agassiz, 

 took 66 specimens of lioth sexes and various sizes at stations 3389, 

 3391, 3390, and 3397 (No. 18474, U.S.N.M.), in Panama Bay, the depth 

 varying from 85 to 259 fathoms. 



