278 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



dotted with black. In the darker specimens the epimera and the uro- 

 pods are almost white, with scattered spots of black. Other specimens 

 are brown with markings of red, and some are bluish-gray in color 

 tinged with brown or orange. 



Type. The type specimen was found at station 3515, latitude 59 59' 

 north, longitude 167 53' west, at a depth of 13 fathoms. Catalogue 

 No. 20031, U.S.N.M. 



Distribution. This species extends all along the coast of Alaska, 

 having been found at the following stations: Station 3272, north of 

 Amak Island (31 fathoms); station 3297, off Cape Menchikoff (26 

 fathoms); station 3246, south of Hagemeister Island (17 fathoms); 

 station 2841, North Head, Akutan Island (56 fathoms); station 3248, 

 off Bristol Bay (21 fathoms) ; station 3600, Aleutian Islands, off Unimak 

 Island (9 fathoms). 



TECTICEPS CONVEXUS Richardson. 



Tecticeps convexux RICHARDSON, Proc. U. S. Nat. Mus., XXI, 1899, pp. 837-838; 

 Ann. Mag. Nat. Hist. (7), IV, 1899, pp. 181-183; American Naturalist, 

 XXXIV, 1900, p. 223. 



Locality. Monterey Bay, California. 



Depth. 30 feet, sandy bottom. 



Body oval, somewhat flattened. Surface smooth; color light yellow 

 with markings o-f brown. 



Head with the anterior margin much broader than the posterior mar- 

 gin, produced in front but not wholly concealing the basal joints of the 

 first pair of antennas, and somewhat raised, forming two small convex 

 elevations. The antero-lateral margin is likewise produced, forming 

 an acute angular projection, which extends in a lateral direction beyond 

 the post-lateral margin of the head. The eyes are dorsally situated in 

 a median transverse line. The first pair of antennae, with a flagellum 

 of sixteen articles, extend to the posterior angle of the third tho- 

 racic segment. The second pair of antennas, with a flagellum of thir- 

 teen articles, extend to the middle of the fourth thoracic segment, and 

 exceed by one joint the length of the first pair of antennas. Both pairs 

 of antennas are disposed to lie concealed under the broad epimeral 

 plates of the thoracic segments. 



The thoracic segments are subequal in length. The first segment 

 has its antero-lateral angles produced around the anterior portion of the 

 head, forming a broad plate at the .side of the segment. The epimera 

 are almost twice as broad as long; those of the fifth segment extend 

 downward, with the anterior margin straight, making the length and 

 breadth about equal, and forming almost square epimera; in the epim- 

 era of the sixth and seventh segments the anterior margins are in the 

 same direction as the posterior margins, which extend downward. 



