APPENDIX. 



Pennaria disticha (see page 24). 



Pennaria caoolini, Goette, 1907, Zeit. fur wissen. Zool., Bd. 87, p. 46, taf . 4, 5, fign. 85-96.— Camfenhausen, 1896, Zool. Anzeiger, 

 Bd. 19, p. 104 (hydroid from Ternate). 



Goette discusses the development of the germ cells and of the medusa-buds. 

 Cerfontaine, 1902 (Archiv. de Biologie, tome 19, p. 251, planches 8-9), gives an elaborate 

 account of regeneration and heteromorphosis in Pennaria from Naples. 



Pennaria tiarella (see page 25). 1^- 



Pennaria, Smallwood, 1909, Biol. Bull. Woods Hole, vol. 17, p. 219, plates 1-4. 



(')Pennaria symmetrica, Thornely, 1908, Journal Linnean Soc. London, vol. 31, Zool., p. 81, from Shab al Shubuk and the 



quay-side of SuaUim, Red Sea. 

 (?) Pennaria inornata, Brooks, 18S2, Studies Johns Hopkins Biol. Lab., vol. 1, p. 144. 



Miss Smallwood finds that, before the eggs are mature and while still within the medusa 

 or shortly after being cast out, a membrane which is apparently fluid or gelatinous appears 

 around the egg. This is only a temporary structure, however, and is replaced by the true 

 membrane which forms after fertilization and the beginning of cleavage. Maturation begins 

 and fertilization may take place before the egg is cast out into the water. The polar bodies 

 and apparently all subsequent cleavages are formed by the mitotic process. The sperm head 

 is transformed into the male pro-nucleus. After the two polar bodies are formed a considerable 

 amount of chromatin migrates into the cytoplasm, being transformed into vesicles which are 

 eventually taken up by the cytoplasm itself. There is a distinct centrosphere. The new pro- 

 phase spindle arises within the old centrosphere. Inclusions are often found in the immature 

 egg, but these are not seen during the segmentation stages. 



Pennaria vitrea Agassiz and Mayer (see page 28). 

 Pennaria vitrea, Bigelow, H. B., 1909, Bull. Mus. Comp. Zool. at Harvard College, vol. 37, p. 186, plate 7, fig. 4. 



Bigelow found a single specimen of this medusa near Easter Island, tropical Pacific. It 

 was 4 mm. high and 3 mm. in diameter. The tentacle-bulbs were yellowish and the manu- 

 brium milky. 



Sarsia resplendens Bigelow=S. eximia (?). 

 Sarsia r«/>/fn*nj, Bigelow, H. B., 1909, Mem. Mus.Comp. Zool. at Harvard College, vol. 37, p. 181, plates 7 and 40. 



Bell 2 mm. high, 1.5 mm. wide, rounded, with uniformly thin walls. 4 tentacles only half 

 as long as bell height and bearing 6 to 10 prominent, non-ringed, nematocyst swellings. Each 

 tentacle terminates outwardly in a spherical pad. Tentacle-bulbs swollen and with large 

 abaxial ocelli. Manubrium only about half as long as depth of bell-cavity. Mouth a round 

 opening. Gonad encircles manubrium from base almost to the lip. No axial canal above 

 stomach. Near the base of the manubrium are 8 adradial spots of vermillion and yellow 

 pigment granules. Entoderm of tentacles vermillion with a spot of ochre-yellow in tentacle- 

 bulbs. Ocelli black. Acapulco Harbor, Pacific coast of Mexico. This medusa bears so close 

 a resemblance to Sarsia eximia (page 57) that I am inclined to suspect that it may be identical 

 with the well-known Atlantic medusa. It may possibly be distinguished by its knobbed ten- 

 tacles and its yellow and red color. 



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