20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



CALLIANASSA (CALLICHIRUS) ACANTHOCHIRUS STIMPSON 



Glyptunis acanthochmis Stimpson, Proc. Chicago Acad. Sci., vol. i, p. 46, 1866; 

 Ann. Lye. Nat. Hist. New York, vol. 10, p. 121, 1871 ; de Man, Siboga- 

 Exped., monogr. 39a°, p. 19, 25, 180, 1928. 



De Man has already intimated that Glyptunis as a genus is perhaps 

 not distinct from Callianassa. His point is well taken, for any ex- 

 amination of the subgenus CaUichiriis will show a number of species 

 that have third maxillipeds approaching, if they do not actually possess, 

 the Glyptiirus type of external maxilliped. The generic character 

 given by Stimpson and based on these appendages, " ischium armed 

 along the middle of its inner [face, instead of edge as Stimpson has 

 it — surely a slip of the pen] with a sharp, prominent, spinous crest," 

 is common to the majority of the species of Callianassa ; as are the 

 " deeply sculptured caudal lamellae," to a number of the representa- 

 tives of the subgenus Callichirus. Little needs otherwise to be said 

 of this well-characterized and easily recognizable species. The oppor- 

 tunity is here taken (pis. 1-4) of supplying some photographic details 

 of a male specimen of the species. On the distal half of the inner 

 face of the ischium of the third maxilliped (pi. 3, fig. 4) is a comb of 

 10 spinous teeth of irregular size, but roughly, more or less alternately 

 large and small ; near the proximal margin of the joint and continuing 

 the line of the comb are four large and one much smaller dentiform 

 tubercles. 



EXPLANATION OF PLATES 



Plate i 



Fig. I. Callianassa jamakense, c^, carapace and frontal appendages, X about 2-^. 



2. C. jamaicense var. lonisianeiisis, (S, same. 



3. C. islagrandc, S, same. 



4. C. longiventris, c?, same. 



5. C. rathhunae, c?, same. 



6. C. acanthochmis, c?, same. 



Plate 2 



Fig. I. Callianassa islagrandc , 3, chelipeds, X I- 



2. C. rathbunae, <S, same. 



3. C. longiventris, c?, same. 



4. C. jamaicense var. louisia)icnsis, <^, same. 



5. C. acanthochirus , c^, same. 



6. C. jamaicense, ^, same. 



7. C. jamaicense var. louisianensis , J', a, d, inner and outer faces of third 



maxilliped ; b, c, inner and outer aspects of third leg, X about 2\. 



8. C. jamaicense, <S- a, d, inner and outer faces of third ma.xilliped; b, c, 



inner and outer aspects of third leg, X about 2\. 



