14 BULLETIN 2 01, UNITED' STATES NATIONAL MUSEUM 



may be objected that no genotype is mentioned for Chalaraspidum and 

 that, therefore, as a generic name it is void, but the passage quoted 

 above refers beyond doubt to C. alata, and there need be no hesitation 

 in quoting it as the genotype. The use of the generic name Chala- 

 raspidum has the additional value of emphasizing Willemoes-Suhm's 

 association with this remarkable crustacean, and, by its closely similar 

 sound, reminding workers on this group of Crustacea of the affinities 

 of the genus as they suggested themselves to its discoverer. 



CHALARASPIDUM ALATUM (Willemoes-Suhm) 



Chalaraspis alata Willemoes-Suhm, 1876b, p. 592.— G. O. Sars, 1885, p. 51, figs. 1, 

 2 —Hansen, 1912, p. 182, pi. 1, fig. l,a-l.— Face, 1939, p. 68, figs. 1-7. 



Occurrence. — California: Albatross station 4334, 1 specimen, 32 

 mm. Japan : Albatross station 4919, 1 specimen, 38 mm. ; Albatross 

 station 4960, 1 specimen, 37 mm. West coast of South America: 

 Albatross stations 4672* and 4719*, identified by Hansen (1912) . 9 



Distribution. — South of Australia {Challenger) ; west of Peru 

 (Hansen, 1912) ; China Sea and near New Guinea (Fage, 1939) ; west 

 of California and the Eastern Sea (present material). The species is 

 therefore widely distributed in the deep water of the Pacific Ocean, and 

 it is not yet known from elsewhere. Zimmer ( 1914) has recorded a 

 specimen of the genus from the deep water of the Atlantic near the 

 Azores, but the material was not apparently in a sufficiently good state 

 of preservation to describe. The specimen appears to belong to a new 

 species. 



Remarks. — The specimen from station 4334 agrees very closely with 

 the descriptions and figures given by Hansen (1912) and Fage (1939) . 

 The other two specimens differ in the following particulars : (1) The 

 rostral plate has the outer anterolateral angles drawn out into con- 

 spicuous spines ; the margin between these spines is lightly concave in 

 the center and is microscopically serrulated; there are three or four 

 spinules on the lateral margins of the rostral plate on each side and a 

 prominent ocular spine on the carapace margin over the eye ; there are 

 also scattered microscopic spinules on the lateral area of the carapace 

 below and behind the eyes. (2) The outer margin of the antennal 

 scale has only three or four teeth in addition to the terminal tooth. 



Both these specimens have seven spines on the lateral margins of the 

 telson. One of them also still has the apical armature of the telson 

 almost intact and shows this to consist of four rather stout and closely 

 set spines, the inner pair nearly twice as long as the outer pair. This is 

 the first time it has been possible to indicate the apical armature of the 

 telson. In Hansen's specimen the tip of the telson is clearly broken. 

 Fage says that the apex of the telson is provided with four short spines, 



8 Specimens from stations marked with an asterisk were not examined by me. 



