Effect of Successive Removal upon Regeneration 501 
TABLE 14—PALaEMoNn TENUICORNIS 
Molting Periods 
PERIOD DURING WHICH THE REGENERATION OCCURRED, 
IN DAYS. 
CATALOGUE NUMBER = - 
| First Regenera- Second Regenera-| Third Regenera- 
tion tion tion 
TAGBacogcbesDDnRoocespudadr GoObeaqdosnuor 9 9 8 
IM ohoooe sap bASoe do dds ODOR oOnedodrOD as 15t 9 10 
TYE AG Sogn anode CtrCs DEORE MDAC OCC OOoTAE 10 10 9 
GiB ac Sagbc AJ OO eae esr OoobonS abe caro Hao 16} II 8 
MAA OM are RT aisle voseiar oie) sraresaisi< 3yaicte aise si suger 10 | 10 10 
Ti v 569 GSUDGOOUGUUOU ALU pnn apaDHUACOOnonoE 13 | II 
HAUG, gto a niKOOGBEDOCATOOe IacBaqapHoUcau 13 II Il 
WAL dg capstone dopo Obn IGEREeOD DD OAROL 8 9 8 
IBTGR Goch G6 GUBROAO oT Ben tnone oboe ceeae 9 12 
TSP sab gaa ne Obe SU OCR OR Tea aac meus 13 10 10 
EMBSNT ES cosonga oan DEAE OGS odo OO sHMa0dGdae 10.6 10.2 9.25 
8 cases 10 cases 8 cases 
to a molt. The irregularity in these shrimp data is probably 
due in large part to the habits of the animals. The water in the 
dishes had to be changed every day and it was impossible to do 
this without greatly disturbing the shrimps which in their violent 
struggles were often considerably bruised. Such injuries are 
difficult to estimate. 
The data under the present head thus leave one in doubt as 
to the effect of successive removal as an independent factor because 
of the small number of individuals and the lack of control of the 
age and other factors. In speaking merely of the amount of 
regeneration after successive removals of a single chela without 
reference to the analysis of the factors involved, the statement 
may be made that in shrimps of the species Palamon tenuicornis 
with thoracic lengths between 6.8 mm. and 13.1 mm. the amount 
of regeneration decreases with successive removals. 
