204 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



Acanthohaustorius spinosus (Bousfield) 1962 



Figures la, 3d, 4:C, 26, 27 



Material examixVed. — Gulf of Maine, Delaivare dredge haul no. 5, 

 sta. 100, 42°41', 66°28', 80 fms., Aug. 8, 1959: 1 9 (br. II), (NAIC 

 7044). Scotian Shelf, 100 miles off Halifax, A. T. Cameron sta. 64, 

 43°32', 63°0r, dredge haul, 100 fms.. May 8, 1961, S. W. Gorham: 

 11 99, 6 ov., 10 &&, 5 imm. (NMC 7045). 



Vineyard Sound, Mass., Quick's Hole, SE entrance, sand, 45 ft. 

 grab, Sept. 18, 1963: 14 adult, 6 imm, (MBL, author collections). 

 No, 540, 67°27', 41°02', June 17, 1953: 1 cT', (USFW, R. L. Wigley 

 collections) . 



Remarks. — Author's figures (1962b) are reproduced here (with 

 slight alterations) for comparative purposes and generic diagnosis. 



The present material contains males of 6-8 mm. in size. These are 

 sunilar to the females in external appearance. Antennae 1 and 2 

 apparently lack calceoli in either sex. This species shows features 

 that are akin to the genus Parahaustorius, namely, the strongly 

 spinose peduncle of uropod 1, the shortened urosome segment 2, the 

 relatively small peraeopod 3, and the posteriorly broadening head. 

 The subspatulate form of segment 6 of peraeopod 4, and the broadly 

 sub truncate telson, apically long setose, are typical of the genus 

 Pseudohaustorius . Until further material can be studied, it seems 

 advisable to define the genus Acanthohaustorius sufficiently broadly to 

 include A. spinosus. This species has a remarkable bathymetrical 

 range, from the lower intertidal of sand}^ beaches iu the Bay of Fundy 

 to depths of 100 fathoms on the Scotian Shelf. The present records 

 extend its geographical range southward to Georges Bank and the 

 south side of the Cape Cod peninsula. 



Acanthohaustorius shoemakeri, new species 



Figures 28, 29 



Material examined. — -Marthas Vineyard, Mass., off Gay Head, 

 Fish Hawk sta. 1126-28, 9-14 fms., Aug. 28, 1882: 1 9, holotype, 

 1 9, ov., paratype (USNM 33727). 



Description. — Female, 6.0-6.5 mm. Head shape similar to that 

 of A. intermedius ; eyes not observed in present material. 



Antenna 1 : peduncular segment 2 slender, nearly equal to segment 

 1; flageUum 9-10-segmented; accessory flagellum of 2 slender subequal 

 segments, subterminaUy attached to peduncle 3. Antenna 2: pedun- 

 cular segment 4 moderately deep, smoothly convex and richly plumose 

 behind; flagellum 7-segmented, 1st longest, plumose posterodistally. 



