CONOR and CONOR: LARVAE OF FOUR PORCELLANIDAE 



lateral seta. Basal endite bilobed: distal lobe 

 with 32 to 34 setae; proximal lobe with about 19 

 setae. Coxal endite bilobed: distal lobe with 

 about 19 setae; proximal lobe with about 39 

 setae. 



Maxilliped I with exopodite bearing three mar- 

 ginal setae; endopodite with two terminal setae 

 in specimens dissected; basal portion of protop- 

 odite produced into triangular lobe bearing 35 

 to 42 setae; coxal lobe with numerous setae num- 

 bering 16 to 21 in specimens counted. 



Maxilliped II with two-segmented exopodite 

 usually bearing six setae on terminal segment 

 and six internal marginal setae on proximal seg- 

 ment. Endopodite composed of four segments 

 the distal two of which are armed with dense 

 setal brushes each containing about 16 to 20 

 setae. Other setation as figured. 



Maxilliped III with single-segmented exop- 

 odite bearing two very fine setae. Endopodite 

 with five well-developed segments; segments 2 

 through 5 armed with filtering setae; segment 

 2 with 13 major setae along dorsal inner margin; 

 segment 3 with three major ventral and four or 

 five major dorsal internal marginal feeding 

 setae, seven or eight minor submarginal brush- 

 like setae dorsally and five ventral major sub- 

 marginal brush setae ; segment 4 with 10 major 

 ventral marginal feeding setae, 9 minor dorsal 

 marginal feeding setae, protuberance distally 

 and dorsally on segment bearing a row of 5 

 major brush setae and a subordinate row of 4 

 spikelike setae and 1 fine seta; segment 5 with 

 five major ventral and four or five dorsal (mixed 

 major and minor) feeding setae, two slender 

 terminal brush setae; three major brushes and 

 two spikes on dorsal, submarginal bulge. 



Pereiopods well developed and functional. 

 Chelae slender, narrow, dorsoventrally flattened 

 with two fixed spines present on internal margin 

 of carpus. Walking legs all similar in form and 

 setation as figured. Pereiopod 5 chelate with 

 bristles and hooked setae for cleaning as figured. 



Abdomen segments numbering 6, segments 2 

 through 5 with paired biramous pleopods; mar- 

 ginal setation of pleopod exopodites varies from 

 10 to 13, the higher numbers generally being 

 found on the more proximal pleopods; each 

 pleopod endopodite is armed with four small 



hooks and two setae. Segment 2 bears one 

 chromatophore distally. A pair of biramous 

 uropods articulate with segment 6; the outer 

 ramus with 15 or 16 marginal setae, inner ramus 

 with 10 or 11 marginal setae. 



Telson with 15 or 16 major marginal plumose 

 setae and usually four minor setae placed ap- 

 proximately symmetrically with respect to the 

 center line of the telson between the major 

 marginal setae; dorsal surface of telson bears 

 about 10 pairs of fine setae in approximately 

 symmetrical positions. 



LARVAL DEVELOPMENT OF 

 PACHYCHELES PUBESCENS HOLMES 



Larvae taken from the plankton were reared 

 in unaerated Erlenmeyer flask cultures and 

 identified at a later date by comparison with 

 laboratory hatched larvae. 



PREZOEA 



The general body form of Pachycheles puhes- 

 cens is the same as that described for Petrolis- 

 thes cinctipes prezoeae; however, certain details 

 of the prezoeal cuticle of the telson diff"er from P. 

 cinctipes. The prezoeal cuticle of Pachycheles 

 pubescens is produced into flat spines with 

 toothed margins (Figure 2) , an additional adap- 

 tation for swimming by abdominal flexion. Chro- 

 matophores occur as follows: one on either side 

 of the mouth; one each on abdominal segments 

 1, 2, 3, and 5; and one on the telson. 



ZOEA I 



(Figure 10) 



Antennule unsegmented with five or six ter- 

 minal processes including three or four aesthet- 

 ascs and one or two setae. 



Antenna biramous with endopodite and pro- 

 topodite fused ; endopodite without subterminal 

 tubercle or fine seta; exopodite 1% to 2 times as 

 long as endopodite; usually three short stout, 

 curved spines along internal lateral margin dis- 

 tally on exopodite, but spines occasionally num- 

 ber one or two and rarely four. 



207 



