CONSPECTUS OF TIIK FAMILIES AND OKNKI.'V. '_". 



I Valves with decided ribs, fays, or furrows, connect 

 ing the ( usually large) processes or tubercles 



AULACODISCl'S l.\\\. 



L A r alves not as above ....2 



('Valves circular; with a radiating series of minute 



punctae, and marginal tubercles Pcritlit/ra i.xxxn. 



Marginal tubercles smaller, valves radiate granulate, 

 o circular or oval CESPODISCI'S Lxxxn 2 . 



o. ^ 



All others, ocelli (tubercles, or processes) generally 

 quite large, and few, usually sub-marginal ; cel- 

 lules or granules, rarely radial, or minute 



EUPODISCUS LXXXIII. 



FAMILY XIII. HELIOPELTE.K. 



f Valves with marginal spines obsolete; or if present, 

 few, and in alternate compartments 



ACTINOPTYCHUS LXXXIV. 



I Valves not as above 1 



Valves with a hyaline (stellate) umbilicus, with mar 

 ginal spines or teeth, connected by a radial rib . -- 



Halionyx LXXXV. 



1. | Valves with numerous marginal spines or teeth ; and 

 a hyaline umbilicus ; often hyaline spaces at the 



base ( angles) of each compartment 



I HELIOPELTA LXXXV i. 



FAMILY XIV. ASTEROLAMPRE.E. 



I Valves hyaline, angular or circular ; with straight 

 rays or ribs not expanded at margin or center, and 



not reaching the margin LISOTEPHANIA LXXXVII. 



Valves not as above 1 



Disc radiate-punctate, cellulate or granulate; with 

 several well-defined linear blank spaces (ribs j, from 



1. ] the margin inwards ; center granulate, not stellate. 



AcriNoniscrs LXXXVIII. 

 Valves not as above . 



Valves inflated, hyaline, or punctate, center some- 

 times stellate ; rays linear; more or less bifurcat- 



2. i ing, and somewhat irregular: interspaces blank, 



or with curved or sinuose lines .CLADOGE \MM v i.x\\i\. 

 Valves not as above 



