CALANOID COPEPODS FROM GULF OF MEXICO 



363 



similar to those in S. lamellatiis Sars (1902: pi. 

 42). Rostrum absent as in other species of genus. 



Ant'LT M.xi.K : Ditfere jjrimarily in form of jzen- 

 ital segment, second abdominal segment, and fifth 

 legs. 



Genital segment asymmetrical in dorsal view, 

 left side extending farther laterad than right ; left 

 side in lateral view with oblique ridge (figs. 2, 6). 



Second abdominal segment with left postero- 

 ventral portion produced in short liooked process 

 (fig. 2) ; similar hooked process also typical of »S'. 

 arcfwus Sars. 



Right fifth leg with terminal segment spini- 

 form, distal half curved, proximal half straight, 

 inner margin bordered by low lamella (fig. 14). 

 Left fiftli leg with penultimate segment tumid, 

 proximal portion with falcate spiniform process 

 and scooplike process, midportion with elongate 

 lamelliform process bearing proximal spur; short 

 terminal segment with apical rodlike process, sub- 

 apical scooplike process, lateral scooplike process; 

 anteromedial portion of terminal segment with 

 two short thick spines (figs. 2, 6, 14). 



Remarks:. — In the female the new species is 

 readily distinguished from previously described 

 forms of the genus by (1) the greater length of 

 the left side of thoracic fusion segment IV-V, (2) 

 the asymmetrical laterial swellings of the genital 

 segment, and (3) the straight midventral spine 

 extending posteriad from the genital orifice. 



In the male the new species is easily separated 

 from the other species by (1) the spiniform ter- 

 minal segment of the left fifth leg, and (2) the 

 combination of scooplike, lamelliform, and spini- 

 form processes extending from the tumid penulti- 

 mate and terminal segments of the right fifth leg. 



The new species is named in honor of Dr. 

 Elizabeth Deichmann (Curator of Marine In- 

 vertebrates, M. C. Z., Harvard XTniversity) as an 

 expression of my deep gratitude for her beneficial 

 aid and patient understanding during the period 

 of my graduate studies under her tutorage. 



LITERATURE CITED 



Bbodski, K. a. 



1950. Calanoida of polar and far eastern seas of the 

 V. S. S. R. Tabl. anal. Fauna U. R. S. S., 35: 

 1-442, 360 text figs. (In Russian.) 



GlESBRECHT. W. 



1892. Systematik unci Faunistik der Pelaglschen 

 Copepoden des Golfes von Neapel. Fauna u. Flora 

 Golf. Neapel, 19 : 1-831, 54 pis. 

 Mori, T. 



1937. The pelagic Copepoda from the neighboring 

 waters of Japan. Tokyo, 150 pp., 80 pis. 

 Rose, M. 



1933. Copepodes Pelagiques. Faune de France, 26 : 

 1-374, 456 figs. 

 Sars, G. O. 



1902. An account of the Crustacea of Norway. 4 : 

 Copepoda Calanoida. Bergen. 171 pp.. 108 pis. 

 SCHMITT, W. L. 



1954. Copepoda. Fish. Bull. 89, U. S. Fish and 

 Wildlife Service, 55: 439-142. 

 Scott, A. 



1909. The Copepoda of the Siboga Exped. Pt. 1. 

 Free-swimming. littoral and semi-parasitic 

 Copepoda. Sibogu Exped., 29a : 1-323, 69 pis. 

 Sewell, R. B. S. 



1947. The free-swimming planktonic Copepoda. 

 Systematic account. .Tohii Murray Exped., 1933-34. 

 Sci. Rept., 8 : 1-303, 71 text tigs. 

 SvERDRUP, H. U., M. W. Johnson, and R. H. Fleming. 

 1942. The Oceans. Their physics, chemistry, and 

 general biology. Prentice-Hall, Inc., New York, 

 1087 pp., 265 tigs. 

 Vanhoffen, E. 



1907. Crustaceen aus dem Kleinen Karajakfjord in 

 West Gronland. Zool. Jahrb., Syst., 35: 507-524, 

 pis. 20-22. 

 Vervoort, W. 



19.52. Fiches d'identiflcation du zooplankton. Cons. 

 Int. Explor. Mer, Zooplankton Sheet 43. 

 Wilson, C. B. 



1942. Sci. Res. of Cruise VII of the Carnegie, during 

 1928-1929. Biol. I, The copepods of the plankton 

 gathered during the last cruise of the Carnegie. 

 Carnegie Inst. Washington. Publ. 536: 1-237, 136 

 figs. 

 19,50. Copepods gathered by the U. S. Fish, steamer 

 .\lbatro.is from 1887 to 1900, chiefly in the Pacific 

 Ocean. V. S. Nat. Mus.. Bull. 100. 14: 141-441. 

 pis. 2-36. 



U. S. GOVERNMENT PRINTING OFFICE 1957 O — 414303 



