NO. 2 MUD SHRIMPS — SCHMITT I5 



on lower border to tip of fixed finger, is 15.5 long; upper border of 

 palm to articulation of dactylus 10, broken dactylus 'j.'j, width of palm 

 at middle of length 11, length of upper border of carpus, as well as 

 width, II, upper border of merus 10.3, ischium 8.6. Small chela, 

 movable finger 10, upper border of palm 4.3, width 6.5, lower border 

 to tip of fixed finger 12, carpus 5.7, width at middle of its length the 

 same, merus 6, ischium 6.5. 



Remarks. — In giving a name to this proposed new variety, I am 

 reminded of the varietal form that de Man " has indicated for Borra- 

 daile's C. (Calli'chirus) novae britanniae, and again of his discussion" 

 of C. (TrypJiaea) ealiforniensis var. japonica Bouvier and C. (T.) 

 japonica {Ortmann) and his C. (CallicJiirits) longiventris var. horra- 

 dailei^^ I believe the specimen worthy of varietal designation until 

 such time as additional material may call for a change of opinion. 



CALLIANASSA (CALLICHIRUS) RATHBUNAE, n. sp. 



With tridentate front and the '* oval " area before the cervical groove 

 scarcely delimited from the front, although a very faintly indicated 

 groove crosses the anterior part of the carapace at a distance behind 

 the orbital margin about equal to the length of the rostrum ; laterally, 

 this faint groove trends l)ackward and downward toward the linea 

 thalassinica on either side but does not join either it or the cervical 

 groove behind. The cervical groove is deep and crosses the dorsum 

 of the carapace about two-sevenths of the length of the carapace in 

 advance of its hinder margin. The rostrum is a slender short spine 

 reaching about one-half the length of the contiguous portions of the 

 inner margin of the eyestalk. The latter are in contact for about two- 

 thirds of their length, flaring in the anterior third widely outward to 

 terminate each in a little pointed tubercle at the juncture of the inner 

 border of the eyestalk and the gently incurved outer border in front 

 of the cornea. This tubercle lies in line with the midpoint or center of 

 the cornea and about the length of the corneal diameter in front of it. 

 The corneae are light brown and occupy the outer two-fifths of the 

 width of the stalk and approximately the fourth and fifth sevenths of 

 the length of the stalk. 



The eyestalks just overlap the distal margin of the basal segments 

 of the antennular peduncle ; thus the first segment of this peduncle 

 is not visible except for a small portion either side of the eyestalks ; 



'" Capita Zoologica, vol. 2, pt. 6, p. 49, 1928. 

 ^' Idem, pp. 18, 19. 

 '^Idem, p. 27. 



