90 THE NAUTILUS. 



females found by myself on Aug. 31, '14, not a single gravid 

 one turned up. Wilson and Clark (Bur. Fisher. Doc. 758, '12, 

 p. 48) report glochidia in July for C. glans. 



All specimens examined have the same anatomical structure 

 agreeing with that of C. glans. The caruncle of the mantle- 

 margin generally is brown, lighter or darker, varying to white 

 or blackish. Its shape is short subcylindrical or hemispher- 

 ical. The edge of the marsupium has black-brown pigment. 

 The glochidia are subovate, higher than long, L. 0.17 to 0.18, 

 H. 0.19 to 0.20 mm., thus agreeing with those of C. parva, as 

 described previously (NAUTIL. 28, '15, p. 181). 



CO.N T RADILLA CAELATA (CONRAD). (See: Lemiox rimosus (Raf.). 



Ortmann, 1. c. . p. 574.) 



Anatomy: see NAUTIL. 30, '16, p. 39. The nomenclature 

 will be discussed elsewhere. The new generic name Conradilla 

 takes the place of Lemiox Raf. , used in the publications referred 

 to. 



MEDIONIDUS CONRADICUS (LEA). (See: Medionid. plateolus (Raf. ) 

 Ortmann, 1. c., p. 575.) 



Anatomy: see Ann. Cam. Mus. 8, '12, p. 335, fig. 22, and 

 NAUTIL. 28, '15, p. 142. A misprint in the latter paper should 

 be corrected; the L. of the glochidium is 0.22 mm., not 0.28. 



The breeding season is now rather well known; gravid females 

 are found from the beginning of September (earliest date Sept. 

 6), and glochidia as early as Sept. 13; discharge of glochidia 

 has been observed in numerous cases from May 11 to May 20. 



EURYNIA (MICROMYA) PERPURPUREA (LEA). (Ortmann, 1. c., 

 p. 576. ) 



Anatomy: see NAUTIL. 29, '15, p. 68. 



Immature glochidia have been found on Sept. 5, '18, mature 

 ones on Sept. 21, '12. 



EURYNIA (MICROMYA) NEBULOSA (CONRAD). (Ortmann, 1. c., 



p. 577.) 



Anatomy: see NAUTIL. 29, '15, p. 64. 

 Investigation of additional specimens has confirmed the char- 



