FISHERY BULLETIN: VOL. 87, NO. 4, 1989 



ventral tooth, while in M. marianica the ter- 

 minal spine is elongate and the ultimate ventral 

 tooth is nearer to the penultimate one. The 

 above listed differences were confirmed by ex- 

 amination of the holotype of M. tuftsi (USNM 

 171336) as well as an additional male specimen of 

 M. tuftsi taken at Galathea station 450 in the 

 Celebes Sea (unpubl. data). 



Munidopsis subsquamosa and M. crassa are 

 also similar to M. marianica. General character- 

 istics of M. subsquamosa were examined on 2 

 snytypes (/, and softened remains, BM 88:33; 

 and the holotype o'' of M. subsquamosa 

 aculeata, BM 88:33), both described by Hender- 

 son (1885, 1888) now deposited in the British 

 Museum (Natural History), and on 2 examples of 

 M. subsquamosa taken rather near its type 

 locality by the Soyo Maru, reported earlier by 

 Baba (1982:114). Examined also were the ab- 

 dominal fragment of the holotype of M. crassa 

 (USNM 8536) in which both the telson and the 

 sixth abdominal segment are intact, and 2 speci- 

 mens (1 ci", 1 referable to M. crassa (USNM 

 231328) that taken by the RV Aivin from the 

 North Atlantic Ocean southeast of Massachu- 

 setts (lat. 38°18'24"N, long. 69°35'30"W, 3,506 

 m) very near the type locality. The anterior 

 branchial region of the carapace usually bears 

 elevated, scaleHke striae in M. subsquxnnosa 

 instead of tubercles or spinules as in M. crassa 

 and M. marianica. The posteromedian margin of 

 the sixth abdominal segment is feebly convex 

 and never exceeds the end of the lateral lobes in 

 M. subsquamosa, but it is markedly produced, 

 overreaching the lateral lobes in M. crassa and 

 M. marianica. The telson (Fig. 2a-e) is rela- 

 tively narrower in M. marianica (length-width 

 ratios: 0.61-0.65 in M. sub,squamosa; 0.68-0.70 

 in M. crassa; 0.79 [,r] in M. marianica). The 

 fingers of the cheliped are distally narrowed in 

 M. subsquamosa and M. crassa, but uniformly 

 wide throughtout the length so as to form a 

 sharply defined ventral spoon in M. marianica. 

 The merus of the cheliped in M. subsquamosa 

 and M. crassa is middorsally ridged, more 

 sharply so toward the proximal end, instead of 

 being bluntly ridged as in Af. marianica. The 

 mesial eyespine is directed anterolaterad in M. 

 subsquamosa and M. crassa, while in M. 

 marianica it is directed nearly straight forward. 

 The rostrum is straight and horizontal in M. 

 marianica, but usually curving dorsad in M. 

 subsquamosa and M. crassa. Finally, the merus 

 of the third maxilliped is more spinose on the 

 flexor margin in M. marianica (bearing about 6 



spines) than in M. crassa and M. subsquam^osa 

 (3 or 4 spines). 



Etymology. — Named for the type locality. 



Munidopsis lignaria New Species 

 Figures 2f, 4 



Munidopsis ciliata. Ambler, 1980:19, fig. 4. — 

 not M. ciliata Wood-Mason in Wood-Mason 

 and Alcock, 1891:200. 



Munidopsis sp. Van Dover, 1988:6, unnumbered 

 fig. 



Material studied. — Eastern Pacific Ocean, 

 Cascadia Basin off Oregon: USNM 240202. Holo- 

 type rf. 44°39.8'N, 125°36.4'W, 2,875 m, RV 

 Yaquina cruise Y 7001 B, stn CP-l-E, BMT 184, 

 16 March 1970, transferred from OSUBI 

 00188.— USNM 240203. Allotype t. 45°18.6'N, 

 126°31.5'W, 2,750 m, RV Yaquina cruise Y 

 7001 B, stn CP-2-C, BMT 265, 18 February 

 1971, transferred from OSUBI 01578.— OSUBI 

 00189. Paratypes, 19 :', 13 V. 44°53.7'N, 

 126°33.4'W, 2,774 m, RV Yaquina, cruise Y 

 7001 B, stn CP-2-D, from log collected in beam 

 trawl 162, 19 January 1970.— USNM 171342. 

 Paratype i. 45°55.3'N, 125°36.1'W, 2,030 m, 

 RV Yaquina cruise Y 7003B, stn CP-l-A, BMT 

 194, 20 March 1970.— USNM 171343. 6 /, 7 V. 

 45°52.5'N, 126°40.8'W, RV Yaq2dna cruise Y 

 7001 B, stn CP-2-A, BMT 154, 16 January 

 1970. 



East Pacific Rise off south central Mexico: 

 USNM 240204. Paratypes, 8 •■/ , 12 V. Western 

 limb of overlapping spreading center near 

 11°52'N, 103°51'W, 2,750 m, Alvin Dive 

 2000, 22 March 1988, from a piece of wood 

 measuring about 15 x 30 cm. Pilot Ralph Hollis, 

 Observers W. Bryan and R. Hekinian 

 (IFREMER). This material was donated to us 

 by Cindy Van Dover, Woods Hole Oceano- 

 graphic Institution, Woods Hole, MA. 



Measurements in mm. — Holotype /, carapace 

 length including rostrum 15.0, margin of orbit to 

 posterior edge of carapace 10.2, maximum car- 

 apace width 9.0; Allotype V, same (respectively), 

 16.5, 11.6, 10.2; smallest Paratype :<", USNM 

 240204, same 9.0, 6.7, 6.3; smallest Paratype 9, 

 USNM 240204, same, 9.2, 6.5, 5.5. 



Description. — Carapace (Fig. ia-b), exclusive 

 of rostrum, longer than broad, moderately 

 arched transversely; anterior and posterior 



904 



