FISHERY BULLETIN: VOL. 75. NO. 2 



E. Tremel. Rio Grande do Sul: 16 6 14 9, MP-USNM, off 

 Barra Casino, 21m, 1 8 December 1961, Ca/ypso stn 153. 1 6 1 9, 

 USNM, Xui', 19 m, 8 January 1962, Calypso stn 183. 



URUGUAY— 8 <5 9 9, MP-USNM, off Punta del Palmar, 

 Rocha, 20-22 m, 21 December 1961, Calypso stn 156. 26 6 35 9, 

 MP, off Punta del Este, 57 m, 21 December 1961, Calypso stn 157. 

 1 :*, MP, N of La Paloma, 33 m, 21 December 1961, Calypso stn 

 158. 34 6 63 9, MP-USNM, N of Cabo Santa Maria, 25 m, 

 8 January 1962, Calypso stn 182. 26 6 48 9, MP-USNM, off 

 Laguna Rocha, 30 m, 22 December 1961, Calypso stn 161. 



7 8 7 9 , MP, off Punta Negra, 18 m, 27 December 1961, Calypso 

 stn 167. 1 3 3 9, MP, off Maldonado, 115 m, 21 December 1961, 

 Calypso stn 160. 1 6 5 9 , ANSP, Bahia Maldonado, W. H. Rush. 



8 cJ 15 9 syntypes ofPhilonicus miilleri, BMNH, off Montevideo, 

 13 fm (24 m), 25 February 1876, Challenger stn 321. 



ARGENTINA — 1 6 3 9 syntypes of Parartemesia carinata 

 Bouvier, MP 49, mouth of Rio de la Plata, 44 fm (80 m), Hassler. 

 13 cJ 11 9, YPM, "Buenos Aires," 15 June 1936. 2 9, USNM, 

 Mar del Plata, 15 December 1922, H. M. Smith. 2 6 2 9 , UMML, 

 Mar del Plata, January 1959 Ex. E. Boschi. 2 9, Quequen, 

 7 January 1924, G. Haedo. 1 9. USNM, Puerto Madryn, 

 Chubut, Ex. Museo Argentino de Ciencias Naturales. 1 6 2 9, 

 Rawson, Chubut, November 1963, E. Boschi. 



Description-Body robust, integument thick, pol- 

 ished except for dorsally pubescent rostrum, 

 narrow bands of setae flanking middorsal carina 

 of sixth abdominal somite, and similar bands 

 along borders of median and lateral sulci of telson; 

 also broad bands of longer setae flanking paired 

 longitudinal ridges of mesial ramus of uropod. 

 Rostrum horizontal (Figure 37), straight, rather 

 short, not reaching beyond distal 0.3 length of 

 second antennular article, with dorsal margin 

 slightly convex, and ventral margin almost 

 straight, occasionally with apical concavity. Ros- 

 tral plus epigastric teeth 7-13 (mode 9; N = 200), 

 epigastric tooth separated from first rostral by 

 interval similar to that between first and second, 

 epigastric tooth located at level of dorsal ex- 

 tremity of cervical sulcus and usually fourth tooth 

 at level of orbital margin. Adrostral carina 



slender, extending from orbital margin to base of 

 ultimate tooth; postrostral carina strong, long, 

 almost reaching posterior margin of carapace, 

 where flanked by paired depressions. Orbital 

 spine short; broad postorbital, antennal, and 

 hepatic spines moderately long and sharp; ptery- 

 gostomian and branchiostegal spines lacking. 

 Cervical sulcus only slightly sinuous, deep, with 

 dorsal extremity situated relatively far from 

 postrostral carina; cervical carina sharp. Hepatic 

 sulcus nearly horizontal from posterior end to 

 depression below hepatic spine, there turning 

 anteroventrally and reaching to pterygostomian 

 region; hepatic carina accompanying anterior 

 part of sulcus sharp; branchiocardiac carina 

 lacking; submarginal carina well marked, hori- 

 zontal posteriorly, turning anteroventrally at 

 about midlength of carapace and then continuing 

 close to free ventral margin of carapace almost 

 to pterygostomian region. 



Eye (Figure 38) with basal article produced 

 distomesially into pubescent, broad scale; ocular 

 peduncle short; cornea broad, greatest diameter 

 slightly less than 2 times that of base of ocular 

 peduncle, its proximal margin moderately slant- 

 ing posterolaterally. 



Antennular peduncle length equivalent to 

 about 0.6 that of carapace; prosartema long, 

 reaching distal 0.4 of second antennular article; 

 stylocerite spiculiform distally, moderately long, 

 its length about 0.65 of distance between its 

 proximal extremity and mesial base of disto- 

 lateral spine; latter sharp and long. Dorsal 

 flagellum filiform, ventral flagellum broad 

 proximally, tapering distally, and bearing mar- 

 ginal (lateral and mesial) patches of long setae 

 proximally, latter continuous with single row 

 distally; in shrimp 24 mm cl, ratio of length of 



FIGURE 37. — Pleoticus muelleri, 9 27.5 mm cl, off Laguna Rocha, Uruguay. Cephalothorax, lateral view. 



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