Genus Pantomus Milne Edwards, 1883 



Rathbun, 1901. p. 117.— Hemming, 1958b, p. 159. 



Pantomus parvulus Milne Edwards 



Figure 71 



Pantomus parvulus Milne Edwards, 1883, pi. 26. fig. 1, la. — 

 Rathbun, 1901, p. 118. — Scnmitt, 1935a, p. 138. 



Recognition characters. — Rostrum longer than 

 carapace, articulated with anterior margin of 

 carapace; basal portion with three dorsal spines; 

 lower margin with numerous slender overlapping 

 spines; terminal half directed upward; tip bifid, 

 lower prong longest. Carapace carinated on an- 

 terior half and armed with three spines, posterior 

 two near together and movable, anterior spine 

 adjoining articulation of rostrum; antennal and 

 pterygostomian spines present. Eyes large. An- 

 tennular peduncle with basal article excavate 

 above and longer than nearly equal second and 

 third articles combined ; stylocerite wide, broadly 

 pointed, inner margin sinuous, tip reaching to 

 midlength of cornea ; upper flagellum about twice 

 diameter of lower flagellum at base. Antennal 

 scale, slender, reaching two-thirds length of ros- 

 trum, broadest near base; lateral spine exceeded 

 by lamella. 



Third maxilliped and first pair of legs reaching 

 to tip of antennal scale. Second pair of legs longer 

 than first; carpus subdivided; one leg with 15 

 to 17 carpal joints, other leg shorter, with 10 to 

 12 carpal joints. Third to fifth legs progressively 

 longer than second pair. 



I'm. i be 71. — Pantomus parvulus Milne Edwards. Animal 

 in lateral view i after Milne Edwards, 1883). 



Abdomen with third segment broadly carinated 

 on posterior half; sixth segment elongate, 2.5 

 times length of fifth. Telson nearly as long as 

 sixth segment, slender; sides concave, tapering to 

 tip ending in a small, median, bulblike enlarge- 

 ment; two pairs of spines at tip, outer pair 

 longest and sinuous at base, inner spines shorter, 

 arising on terminal bulb ; a row of seven or eight 

 small dorsolateral spines on each side in distal 

 two-thirds of length. Uropods long, narrow; 

 exopod with lateral border ending in a slender 

 movable spine. 



Measurements. — Length of body: ovigerous fe- 

 male, approximately 30 mm. 



Variations. — Among four of the cotypes, the 

 rostrum varies somewhat in length and the num- 

 ber of carpal segments in the second legs is 

 subject to variation. 



Habitat. — Seventy-five to 248 fathoms. 



Type locality. — Northern part of Yucatan 

 Bank, lat. 23°13' N. long. 89°16' W., 84 fathoms. 



Known range. — Cape Lookout, N.C., to Yuca- 

 tan, Mexico ; Puerto Rico ; St, Croix, V.I. 



Remarks. — The Catalogue of the Books, Manu- 

 scripts, Maps and Drawings in the British Mu- 

 seum (Natural History), vol. VI, Supplement, 

 1922, lists Milne Edwards' 1883 paper as follows: 

 ''The title-page ( wanting to this copy ) , the 'Liste 

 des Planches,' and many of the plates themselves 

 are lithographed. Only fifty copies were issued 

 and sent mostly to fellow workers, but a few were 

 sold, (See letter by the Author in 'Ann. and Mag. 

 Nat. Hist,' Vol. vi, 1890, p. 471)." 



Family Crangonidae 



First pair of legs subchelate,. stouter than 

 second. Second pair of legs slender, equal ; carpus 

 not subdivided; minutely chelate or simple. 

 Rostrum small, usually dorsally flattened, not 

 toothed. 



Genus Crangon Fabricius, 1798 



Holthuis, 1955, p. 134. — Hemming. 1958b, p. 108. 



The name Crangon confused with the name 

 Alpheus during the first half of this century, had 

 doubtful status until nomenclatural stability was 

 effected by the International Commission on Zoo- 

 logical Nomenclature (Opinion 334)'. The Official 

 List of Generic Names in Zoology (Hemming, 



SS 



FISH AND WILDLIFE SERVICE 



