438 



DISCOVERY REPORTS 



Table 2. Distribution of spines on young colonies of Camptoplites, species 3 to 6 



A, ancestrula. Z 1 , Z 2 , etc., zooecia in order of their formation. A single figure indicates an uninterrupted 

 series of distal spines. Figures separated by a colon (3:1) indicate the number of outer and inner distal 

 spines. Figures separated by a plus sign (9+1) indicate the number of distal and proximal spines. A bracket 

 represents a bifurcation. A black terminal line indicates that the whole specimen or branch has been tabulated. 



The bracket follows zooecium B (Harmer's lettering), and the numbering for each branch continues in 

 the order of the formation of the zooecia starting with the inner (axillary) zooecium at the base of the branch. 



To correspond with the numbering in the table the zooecia in Fig. 41 B marked 5, 6 and 4 should be 4, 

 4 and 5 respectively. 



# Spines on ancestrula represented by obscure stumps. F. Figured specimen. 



Key to the ancestrulae of Camptoplites in the collections 



Ancestrula with long stalk, with a swelling near its base, distal part of ancestrula flattened 



(i.e. distinctly broader from side to side than thick from frontal to basal surface) ... 2 

 Ancestrula with moderate or short stalk without swelling, distal part not flattened 3 



Distal corners pointed, no spines, stalk forms little more than half of total length of an- 

 cestrula Species 1 



Distal corners bear spines and are drawn out giving appearance of a branched spine, a median 

 distal spine on ancestrula and first zooecia, stalk forms more than two-thirds of total 

 length of ancestrula Species 7 



