ZOOLOGY — CRAMPTON, DUERDEN. 277 



impossible to rear all of the progeny. Fifty-seven families of one 

 series, whose parents were perfect in every way, were selected for 

 further rearing and gave over 2,900 pupae in July, 1905. From the 

 members of the second series of 1904, 80 matings were made, giving 

 7,000 eggs, and from 28 families of this group about 1,100 living 

 pupae were obtained. 



Although it was expected that the second series would be double- 

 brooded throughout, this was not the case. Specifically, 105 emerged, 

 while more than 500 of the first series emerged in August, 1905. 

 The moths that emerged were mated in 190 instances, and furnished 

 about 27,000 eggs, and from 39 families of these were reared about 

 1,000 pupae of the third and fourth pedigreed generations. 



Statistics relating to the characters of both larvae and pupae have 

 been determined in all cases, while the adults that have emerged are 

 available for further determinations. This material, together with 

 that of the preceding year, gives statistics of more than 700 matings 

 in this species alone, while the members of over 150 families have 

 been reared. Having, then, the characters of 6,000 pedigreed indi- 

 viduals, it will be possible to prosecute an extensive study of many 

 problems, such as the variation of morphological and physiological 

 characters of the several stages ; the phenomena of selection ; the 

 strength of correlation between and among the several characters 

 of larvae, pupae, and moths ; the correlation of fertility with these 

 characters ; the inheritance of sex, and the strength of inheritance 

 of characters other than sex. 



Duerden, James E., Rhodes University College, Cape Colony. Grant 

 No. 288. Continuation of investigations oyi the morphology and 

 development oj recent and fossil corals and physiology of the Zoan- 

 tharia. (For previous reports see Year Book No. 2, p. xli, and 

 Year Book No. 3, p. 137.) $750- 



Abstract of Report — {a) Morphology and Development of Recent 

 Corals. — During the past academic year investigations were con- 

 tinued, with the help of an assistant, upon the Pacific corals col- 

 lected by Dr. Duerden last year in the Hawaiian Islands. Certain 

 morphological details not occurring in West Indian corals have been 

 disclosed, though on the whole the researches but serve to demon- 

 strate the uniformity of structural plan of the Madreporaria as a 

 whole. Among the new morphological features are ( i ) the presence 

 of a well-defined, diffuse nervous system in the coral Ccenopsamtnia , 

 and (2) the occurrence of much modified permanently invaginated 



