FISHERY BULLETIN: VOL. 75. NO. 2 



; g» g s . ^. .g 



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FIGURE 43. — Hadropenaeus affinis, 9 21.5 mm cl, Mona Passage, off Puerto Rico. Lateral view (third pereopod slightly raised). 



carina ending immediately posterior to cervical 

 sulcus. Orbital margin produced anteriorly into 

 ventrally inclined, short shelf. Postorbital spine, 

 longest of four lateral spines on carapace, located 

 dorsal to base of small antennal spine; branchio- 

 stegal and hepatic spines sharp. Cervical sulcus 

 deep, ending dorsally just posterior to midlength 

 of carapace, and close to postrostral carina; 

 cervical carina sharp; hepatic sulcus sub- 

 horizontal posteriorly, inclined anteroventrally 

 from depressed area below hepatic spine to pit 

 below branchiostegal spine. 



Eye (Figure 44 A) with basal article produced 

 distomesially into pubescent, elongate scale; 

 ocular peduncle moderately long, bearing minute 

 tubercle; cornea broad, greatest diameter 1.5-1.9 

 times that of base of ocular peduncle, strongly 

 slanting posterolaterally. 



Antennular peduncle length equivalent to 0.65 

 that of carapace; prosartema falling short, or 

 barely reaching, distomesial margin of first 

 article; stylocerite length about 0.65 of distance 

 between lateral base of first article and base of 



318 



distolateral spine, terminating in sharp spine; 

 distolateral spine very slender and long, conspic- 

 uously surpassing proximal margin of second 

 article. Antennular flagella long, length of dorsal 

 fiagellum 2.2 and 1.9 times carapace length in 

 shrimp 8 and 23 mm cl, respectively; ventral 

 shorter and broader than dorsal, gently tapering 

 distally, and armed with marginal rows of long 

 plumose setae. Scaphocerite extending to distal 

 margin of antennular peduncle or exceeding it by 

 less than 0.1 of its own length; lateral rib ending 

 in slender spine, reaching to or very slightly 

 beyond distal margin of lamella. Antennal fia- 

 gellum long, although incomplete in all specimens 

 examined, longest observed by me 3 times total 

 length of shrimp. Mandibular palp (Figure 45A) 

 moderately broad, distal article slightly shorter 

 than basal. First maxilliped as illustrated (Fig- 

 ure 455); rudimentary arthrobranchia of corre- 

 sponding somite VII situated near its base (Figure 

 45c-cM. Third maxilliped exceeding antennular 

 peduncle by length of dactyl and half or as much 

 as entire length of propodus. 



