no SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 12$ 



merits; spines on segments 1-4 are anteriorly directed, those on seg- 

 ments 6-8 are posteriorly directed; segment i with transverse row 

 across its middle composed of 8 simple spines with median separation ; 

 segment 2 with 12 simple spines in transverse row three-fourths the 

 distance from the anterior margin, with median separation ; segments 

 3 and 4 each with 16 simple spines in transverse row, with median 

 separation, the eight inner spines near the posterior margin, the other 

 eight somewhat anterior to these in position ; segments 6-8 each with 

 uninterrupted transverse row just behind the anterior margin, seg- 

 ment 6 with 22 spines, segments 7 and 8 each with 30 spines. Ventral 

 surface of abdominal segments : Completely covered with granulosity ; 

 all spines are anteriorly directed ; segment 4 with 10 simple spines in 

 transverse row just before the posterior margin, with median separa- 

 tion ; the five spines on either side of the midline are arranged in two 

 groups of two, and a single spine (innermost) ; segments 5-7 each 

 with 6 simple spines in transverse row somewhat before the posterior 

 margin, the spines evenly spaced, with median separation; outer 

 margin on either side of segment 9 with 3 long simple hairs. Terminal 

 spines very well developed, conical in shape, the apices pointed. 



Respiratory apparatus (pi. 36, fig. 280) of each side arising near the 

 anterior corners of the thorax ; composed of 8 or 9 somewhat flattened 

 ovoid processes that branch as follows: 1-1-4-2-1 ; four of the proc- 

 esses bear a narrow filament from the apex and one process has a 

 filament emerging from the midregion ; there can be much variation 

 in the branching of the filaments but the appearance of the entire 

 apparatus is unique; filaments without superficial segmentation, but 

 with wrinkles in all directions and with microscopic spicules. Maxi- 

 mum length, 1.9 mm. ; average width, 220 /x. 



Cocoon (pi. 39, fig. 320) : Length of base, 3.8 mm. ; maximum 

 width, 1.4 mm. ; maximum height 1.6 mm. Cocoon of wall-pocket type, 

 without collar ; case composed of soft, loose threads that have sand and 

 mud particles attached to them; rim around anterior aperture not 

 thickened. Cocoon covering abdomen and three-fourths of thorax; 

 attached along more than the posterior three-fourths of its base. 



Larva (pi. 40, fig. 360, and pi. 42, fig. 397). — Total length, 7.4 mm. 

 Length of head capsule i.i times its width. Width of thorax 1.5 times 

 that of head. First 4 abdominal segments about 1.3 times width of 

 head ; segments 5-7 expanded, greatest at segment 6 which is 1.4 times 

 width of segments 1-4 ; shape of body similar to that of aquamarensis. 

 General color gray, the neck and ventral part of pseudopod darker ; no 

 dark patches on ventrolateral regions of segments 6 and 7. 



Head: Designs on frons-clypeus and epicranial plates shown on 



