SARSIELLA — KORNICKER 



21 



Eyes: medial eye large pigmented (fig. 8/); lateral eyes smaller 

 with about 6 ommatidia (fig. 8^). 



Description of embryo.— Shell: in lateral view oval without 

 ornamental ridges; uncalcified; surface and margins with long bristles 

 (fig. 96) ; rostrimi absent, postero ventral process small (fig. 9a) 



Figure 9. — Sarsiella zostericola Cushman, embryo, Hadley Harbor, Mass., 0.323 mm: 

 a, posterior process of left valve, lateral view; b, bristles along anterodorsal margin of 

 valve; c, 1st antenna; d, 2nd antenna; e, mandible;/, maxilla; g, 6th limb; h, left furcal 

 lamella; i, ventral part of whole embryo showing right 2nd antenna, mandible , maxilla, 

 Sth and 6th limbs and lamellae of furca, all in place. Same scale in microns: a, b, f-h; 

 c-e, i. 



Dimensions of 4 embryos from S. zostericola (specimen from Hadley 

 Harbor, Mass.) are as follows: 



greatest length (mm) greatest height (mm) greatest width (mm) 

 0.315 0.27G 



0.323 0.235 



0.314 - 0.216 



0.328 0.280 



