r.ll'K. \.\.\RI A LARV-E OF ASTERINA (PATIRIA) MINIATA. 125 



anomaly found in laboratory-bred larv?e of any sort. Such aber- 

 rations are more than likely to be the result of subnormal condi- 

 tions and nothing more. 



LITERATURE. 



Field, G. N. 



'92 The Larva of Asterias vulgaris. Quart. Journ. Mic. Sc., Vol. 34. 

 Grave, C. 



'n Metamerism of the Echinoid Pluteus. Johns Hopkins Univ. Circular, 



New Series, 1911, No. 2. 

 MacBride, E. W. 



'n Two Abnormal Plutei of Echinus in the Light which They Throw on 

 the Factors in Normal Development of Echinus. Quart. Journ. Mic. 

 Sc.. Vol. 57. 

 '14 Text-hook of Embryology, Vol. I. London. 



