188 



K. MITSUKURI : STUDIES ON 





Textfig. 34. 



Lainiogone parva : a — Wheel-like 

 pliite of (lorsiil papilln ; h — ^Same of 

 X^eclicel ; c — Complex plate of pedicel ; 

 d — Supporting rod of pedicel. ( x 240). 



smaller holes typically ten in 

 number. Moreover they are vault- 

 ed with the center highest. Those 

 in the dorsal papillre are 0.035 — 

 0.045 mm. in diameter (textfig. 

 34/>). Sometimes they are oval, 

 being slightly longer in one di- 

 ameter than in the one at right 

 angles to it. In the ventral pedicels, 

 there are similar wheel-like plates, 

 but most frequently there is a 

 tendency to produce a second 

 circle of small openings. Many have several circles of holes 

 (c). The ventral plates are all much larger, 0.06 — 0.075 mm. 

 in diameter (a). There are irregular, bent, thorny supporting 

 rods in the wall of the pedicels and the papillœ (d) ; well- 

 developed end-plates in the pedicels ; and much curved rods in 

 the tips of the tentacles, A'ery much like those in Lœtmogone 

 selenkai. 



EemarJis : — The specimens in alcohol measured respectively 

 2.8x0.45 mm. and 1.9 x0.3 mm. They are, I believe, adults; for, 

 in one specimen (No. 1490) not larger than the three mentioned 

 there are to be seen some eggs which have burst out at the dorsal 

 median line in front. 



Although 1 am unable to make out some anatomical details 

 such as the calcareous ring, the presence or absence of the tentacular 

 ampulLT, or tlie number of genital organs, I do not think there 

 can be much doubt that this species belongs to the subfamily 

 Deimatinne, and to the genus Lœtmogone, This species is very 

 clearly distinguishable from others of Lœtmogone by its calcareous 



