552 
EDWIN S. GOODRICH. 
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EXPLANATION OF PLATE 28, 
Illustrating Mr. Edwin S. Goodrich’s paper on “Proboscis 
Pores in Craniate Vertebrates, a Suggestion concerning 
the Premandibular Somites and Hypophysis.” 
Reference Letters of Plate Figures. 
a. Elongated rod-cell. ace. Anterior ciliated epithelium of wheel- 
organ. acg. Anterior ciliated groove, b. Ciliated cell. blv. Blood-vessel. 
ca. Premandibular tube or canal, cb. Basal canal. cHn. Coelom of second 
somite, into which projects Hatschek’s nephridium. de. Ectoderm 
dorsal to preoral pit. ebc. Epithelium of buccal cavity, end. Endostyle. 
ent Enteron. Hn. Hatschek’s nephridium. Up. Hatschek’s pit. hyp. 
Hypophysis, inf. Infundibulum, la. Left aorta. Ibf. Left buccal fold 
or oral hood. lc. 1 and lc. 2 First and second left coelomic cavities. Is. 1 
and Is. 2 First and second coelomic sacs or somites, m. 1 and m. 2 First 
and second myotomes. nc. Nerve cord. np. Neuropore. npl. Neural 
plate, nt. Notochord, pee. Posterior ciliated epithelium of wheel-organ. 
peg. Posterior ciliated groove, pm. Preoral muscle, pmd. Premandi- 
