3 20 DISCOVERY REPORTS 



KEY TO THE GENERA OF SCRUPOCELLARIIDAE DISCUSSED HERE 



Definitions of the genera of this family are given by Harmer (1923 and 1926), and 

 should be consulted as the genera are recognized on the sum of many characters, few 

 of which are constant throughout the genus, and the following key is therefore un- 

 satisfactory. 



1. Basal heterozooecia vibracula covering greater part of basal surface Caberea 



Basal heterozooecia, when present, avicularia, or vibracula covering only a small part of the 



basal surface ... ... ... ... ... ... •■• ••• ••• ••• ••• 2 



2. Inner series of zooecia (when colony pluriserial) tend to be excluded from basal surface. 



True joints with chitinous tubes 1 absent except in A. kirkpatricki (which is biserial) 



... Amastigia 

 Inner series of pluriserial colonies reach basal surface normally. True joints present except 



in some pluriserial Menipea spp. ... ... ... ... ... ••• ••• •■■ 3 



3. Colony biserial. Basal heterozooecia vibracula, usually present ... ... ... ... 4 



Colony biserial or pluriserial. Basal heterozooecia avicularia when present ... 5 



4. Branches connected by cross-rootlets which join two vibracula. Joint crosses opesia of inner 



zooecium ... ... ... ... ... ... ... ... ... ... Canda 



Cross-rootlets rarely present and only attached to a vibraculum at one end. Joint crosses 



opesia of outer zooecium ... ... ... ... ... ... ... Scrupocellaria 



5. Zooecia grouped in short internodes frequently of only two or three zooecia. No basal 



heterozooecia. Bifurcation of types 9-14 (see Harmer, 1923) 6 



Zooecia form longer internodes. Basal heterozooecia avicularia, when present. Bifurcation 



of types 15, 17 or 18 ... ... ... ... ... ... ... ••■ ■■• • •• 7 



6. Cryptocyst not extensive. Bifurcation of types 9-12 ... ... ... ... ... Tricellaria 



Cryptocyst extensive. 2 Bifurcation of types 13 or 14 ... ... ... ... ... Emma 



7. Bifurcation of type 15. Scutum present or absent. Basal avicularia usually axillary when 



present Notoplites 



Bifurcation of types 17 or 18. Scutum absent. Basal avicularia absent except in M. vectifera 



Menipea 



Amastigia Busk 1852 

 Key to the recent species 

 In this key I have omitted Amastigia abyssicola (Kluge), a deep-water Antarctic 

 species which I have not seen (see p. 331). Some fossil species are known (see p. 496). 



1. Heterozooecia present ... ... ... ... ... ... ... ... ... ... 2 



Heterozooecia absent Amastigia sp. 3 



2. Basal heterozooecia present ... ... ... ... ... ... ... ... ... 3 



Basal heterozooecia absent A. funiculata 4 



3. Mandible of basal heterozooecium more or less setiform ... ... ... ... ... 4 



Mandible of basal heterozooecium not setiform ... ... ... ... ... ... 12 



1 See Harmer (1923, p. 32). 



2 Except in E. cyathus, see p. 358. 



3 Described under A. kirkpatricki, p. 327. 



4 For the species of Amastigia not discussed in this report see Harmer (1923). 



