230 DESCRIPTION OF [Polygastrica. 



mities of branches. Length 1-5 70th; height of tree, 

 1- 140th. 



325. ECHINELLA (?) paradoxa (Styllaria, Bory). The 

 heart-shaped Echinella is smooth and branched ; the lorica 

 is wedge-shaped, or heart-shaped, and is tridentated and 

 truncated. They are solitary, or in fan-like clusters ; 

 stalks slender. Found in salt-water. Length l-570th. 



326. ECHINELLA capitata is smooth, the pedicle branch- 

 less; lorica linear, never wedge-shaped, developed in fan-like 

 clusters, attached to Hottonia palustris. Length 1-1 150th 

 to l-570th; height of cluster l-280th. 



327. ECHINELLA (?) abbreviata. The short-footed 

 Echinella is smooth, the pedicle short and branchless ; 

 lorica wedge-shaped, obtusely tridentated, developed in 

 fan-like clusters. Found in spring-water. Length 1-1 150th 

 to 1- 860th. 



328. ECHINELLA fulgens. The glittering Echinella is 

 striated, and has a short branchless pedicle ; lorica linear, 

 truncated at both ends, not cuneiform. Found in salt- 

 water. Length l-70th. 



Genus LXX. COCCONEMA. The stilt-grain Animalcules 

 are Bacillaria which have a simple siliceous lorica, composed 

 of two or more pieces, longer than it is broad, and attached 

 by one of its extremities to a pedicle, in the direction of 

 its axis ; the lorica is smooth externally, and transversely 

 furrowed internally ; it has two central and four terminal 

 openings ; hence it is closely allied to Navicula, and might 

 be named pedicled Navicula, but the two sides are not 

 symmetrical, as in the latter, though they approach by 

 N. inequalis. The ova cluster is a brownish or greenish 

 mass, divided into four parts ; in some one or two bright 



