736 



SCIENCE. 



[N. S. Vol. XXI. No. 541. 



carbonic, acetic and oxalic acids were used 

 successfully, and in favorable experiments 

 fifty to sixty per cent, of the eggs developed 

 into swimming larvse. 



The larvfe arising parthenogenetically 

 are strikingly normal in appearance and 

 structure, and exhibit clearly marked cel- 

 lular differentiations, as, for example, di- 

 gestive tract, prototrochal band and apical 

 plate with flagella. 



A careful cytologieal and histological 

 study of the material will be made, and 

 the parthenogenetic development compared 

 in detail with the normal. 



2. Material was collected, photographs 

 taken, and observations made in a sys- 

 tematic study of the tunicates of the vicin- 

 ity of Beaufort. 



Dr. Otto C. Glaser, Bruce fellow in the 

 Johns Hopkins University, spent the en- 

 tire season at the laboratory and engaged 

 in experimental studies on the eggs of 

 Fasciolaria tulipa, the natural history of 

 nudibranch molluscs and a study of the 

 development of Aplysia sp. ? 



Aplysias were extremely abundant this 

 season, having been blown upon the Macon 

 Beach and into the harbor by storms. They 

 were actively breeding, and material for 

 the study of the complete life history of 

 the species was secured. Usually this ani- 

 mal is quite rare at Beaufort. 



Dr. Glaser also had the supervision of 

 the 'mess' and to his careful management 

 is due the reduction in the price of board 

 which it was possible to make this year. 



Mr. Samuel Rittenhouse, graduate stu- 

 dent of zoology in the Johns Hopkins Uni- 

 versity, beginning June 12, spent eight 

 weeks at the laboratory, continuing the 

 studies begun last season on the life history 

 of Turritopsis nutricula. From the com- 

 plete set of material procured he will be 

 able to make a detailed study of the de- 

 velopment of this form. He obtained ma- 

 terial also for studies of the development 



of Stomotoca apicata, S. rugosa and an un- 

 determined species of Digonidia. While 

 gathering this material, by regular tomngs 

 in various parts of the harbor, ]\Ir. Ritten- 

 house made observations on the medusae 

 which appear at Beaufort and preserved 

 specimens of each species. During this 

 season and last he has collected about 

 thirty species of hydromedusae, seventeen 

 of which are identified. 



Mr. Howard E. Enders, professor of 

 zoology in Lebanon Valley College and 

 graduate student in the Johns Hopkins 

 University, was at the laboratory twice 

 during the year, from June 18 to August 

 6, and during the month of October. He 

 continued his work to get the post-larval 

 stages in the development of the tubico- 

 lous annelid, Chcetopterus p erg anient aceus, 

 and collected material for an anatomical 

 and histological study of the adult. Ob- 

 servations were made on the activities of 

 the worm and its numerous commensals 

 within the tube, and on the processes by 

 which the tube is formed. The distribu- 

 tion of the animal in the harbor was 

 charted. 



Mr. Bartgis McGlone, professor of biol- 

 ogy in the Illinois Wesleyan University, 

 occupied a table in the laboratory for two 

 months beginning June 26. He studied 

 the breeding habits of Mcera atropos, the 

 spatangoid so common at Beaufort, and dis- 

 covered a method by which the eggs may 

 be artificially fertilized. This result has 

 been repeatedly worked for by several in- 

 vestigators without success, and the discov- 

 ery by Mr. McGlone is a noteworthy contri- 

 bution from the laboratory, for it opens to 

 experimentation one of the most favorable 

 objects for experimental study; the egg 

 being small and very transparent and one 

 in which the processes of matiiration are 

 postponed until extrusion from the body of 

 the mother. 



Mr. McGlone preserved material for a 



