Key to tho species of the genus Merrlamliya 
(fhe letter in parantheses following each species nwa© corresponds to the 
lettering of the species in the review of the genus Merriaaim Just preceding.) 
1. The denml dlacts are hastate tornotes. 
A. The isochelas are typically arcuate. 
1. The principal spicules are entirely spined. 
a. The microscleres are of one sise range* 
i. Principal spicules about 5 micra thick y (a) 
ii. Principal spicules about 10 micra thick aaculatum (i) 
b. The microscleres are of two size ranges lundbecki (h) 
2. The principal spicules vary from shorter, entirely 
spined, to longer, only partially spined loaunertas (j) 
3 . The principal spicules have extremely few, blunt 
spines bonhani (b) 
B. The isochelas have peculiar, long, thin, lateral alae. 
1. Otherwise commonolace certam (c) 
2, Also oddly recurved to form hooks stylodermua (1) 
II. The dermal dlacts are clavigerum (d) 
III. The dermal dlacts are stroi^yles. 
A. The principal spicules up to 95 O micra, microscleres to 
60 micra atl&nti com (a) 
1. The priJMipal spicules under ^IS micra, microscleres 
under 34 micra sophiTBa (k) 
IT. The dermal diacts are tylotes. 
A. The isochelas have peculiar, thin, sharp, lateral alae. 
1. Otherwise commonplace , certua (c) 
2. Also having a peculiarly keeled central slaft lobossBa (g) 
