FISHERY BULLETIN: VOL. 83, NO. 1 



cluster either turned ventrally, or less frequently 

 directed forward. Adrostral carina strong, some- 

 times sharp, reaching between level of last apical 

 tooth and base of ventral apical one. 



Carapace with postrostral carina well-marked, 

 bearing two teeth: 1) epigastric tooth, small, sub- 

 equal to first rostral tooth, situated opposite or 

 only slightly anterior to hepatic spine; and 2) pos- 

 terior tooth, placed between 0.63 and 0.73 (mean 

 0.69) cl from orbital margin, large, about three 

 times as high as epigastric tooth, hooklike at tip; 

 postrostral carina low anteriorly, slightly elevated 

 below apex of posterior tooth, and forming crest 

 from latter descending gently toward ridge on 

 posterior margin of carapace; each tooth preceded 

 by tuft of long setae. Antennal spine small, project- 

 ing from rather long buttress; hepatic spine 

 acutely pointed, much longer than antennal, aris- 

 ing from moderately raised area, and situated be- 

 tween 0.14 and 0.20 (mean 0.18) cl from orbital 

 margin. Postocular sulcus short but deep an- 

 teriorly, continuing posteriorly as weak groove; 

 hepatic sulcus deep, subhorizontal, accompanying 

 inconspicuous carina. Branchiocardiac carina low 

 but clearly distinct, long, extending from base of 

 hepatic region to near posterior margin of 

 carapace, then curving dorsal ly toward base of 

 posterior tooth. 



Antennular peduncle with stylocerite produced 

 in spine distally, extending about 0.8 distance be- 

 tween lateral base of first antennular article and 

 mesial base of distolateral spine; distolateral 

 spine strong, reaching as far as midlength of sec- 

 ond article; antennular flagella short, mesial one 

 slightly shorter than lateral. 



Scaphocerite almost reaching (occasionally 

 overreaching) distal end of antennular pedun- 

 cle; length of antennal flagellum as much as 2.5 

 times cl. 



Third maxilliped slightly stouter than 

 pereopods. Basis and ischium of first pereopod un- 

 armed. 



Abdomen with high dorsomedian carina ex- 

 tending from first through sixth somites; carina on 

 first somite produced in large, apically hooked, 

 triangular anterior tooth, more elevated than 

 posterior tooth on carapace; carina of fifth somite 

 abruptly truncate posteriorly; and that of sixth 

 produced in large, acute posterior tooth. 



Anteroventral margin of pleuron of first abdom- 

 inal somite barely to distinctly concave; antero- 

 ventral angle 90°-100°, that of third and fourth 90° 

 or less, with vertex slightly produced anteroven- 

 trally; pleuron of fifth roughly pentagonal, an- 



54 



teroventral and posteroventral angles with ver- 

 tices slightly produced, posteroventral one often 

 armed with small spine; posteroventral angle of 

 pleuron of fifth and sixth somites armed with 

 spine, that of fifth larger. 



First somite with anteromedian sulcus well de- 

 fined only dorsally but continuing ventrally as 

 shallow depression joining deep posterior tergal- 

 posteromedian pleural sulcus, ridge often extend- 

 ing posteriorly from ventral portion of anterome- 

 dian pleural sulcus to fused posterior sulci. Second 

 and third somites with relatively short, anterior 

 and posterior tergal sulci; short anteromedian 

 pleural sulcus merging ventrally with conspicu- 

 ous broad depression, latter terminating near an- 

 teroventral margin of corresponding pleuron; 

 posteromedian pleural sulcus extending dorsally 

 to about 0.3 height of somite measuring from mid- 

 dorsal line, there curving anteriorly; special in- 

 verted V-shaped ridge Ijdng between tergal and 

 pleural sulci. Fourth somite with anterior tergal 

 and long, united posterior tergal-posteromedian 

 pleural sulci; anteroventral part of latter curving 

 dorsally; often short longitudinal ridge present at 

 about 0.3 height of somite from middorsal line. 

 Fifth somite with anterior tergal sulcus continu- 

 ous with united posterior tergal-posteromedian 

 pleural sulci, anteroventral portion of latter fad- 

 ing as shallow depression; cicatrix extending post- 

 eriorly from ventral end of anterior tergal sulcus. 

 Sixth somite with arched posterior pleural sulcus 

 and with shallow setose depression situated dorsal 

 to long but interrupted strong cicatrix. 



Telson with pair of small, fixed, subterminal 

 spines. Both rami of uropod reaching, or almost 

 reaching apex of telson. 



Petasma (Fig. 45 A, B) with rigid distal projec- 

 tion of dorsolateral lobule strongly curved me- 

 sially, raised proximodorsally in subhemispheric 

 prominence, and ending in bifurcate apex, both 

 tips sharp. Fleshy distal projection of ventrolat- 

 eral lobule falling short of adjacent one, and with 

 terminal part truncate and curved dorsally. 



Petasmal endopods coupled in males as small as 

 5.8 mm cl, about 23 mm tl, but may not be joined in 

 individuals as large as 9 mm cl, about 32 mm tl. 



Appendix masculina as illustrated in Figure 

 45C. 



Thelycum (Fig. 46A, B) with plate of sternite 

 XIV forming slightly to broadly rounded lateral 

 flanges partly surrounding and merging with 

 roughly semicircular, low mesial bulges; latter 

 separated by median depression bearing oval or, 

 occasionally, subhemispheric anterior tubercle (if 



