HYDROZOA. 
Cod. 15 
Family Ccenostromtd;e. 
Arduorliiza , n. g. Astrorhiza with radial tube springing obliquely from 
the central canal. Central canal centrally placed in the middle of the 
stock. A. pyramidata, Chidroo, p. 17. 
Wentzel arranges these families in the following manner : — 
Archistylasteridce. Milleporidce. 
Tubiferaz (Archihydrocorallinaz of Moseley). 
Ccenoslromidce. \ 
Stromatoporidce. 
Heterastridium pachy sty lum ) FRECtt, (32) p. 97. 
• • Family Lamellate. 
Of uncertain position, but probably belonging to Hydrocorallince. 
Lamellce concentric, separated by interlaminar spaces or bound together 
by sharp septa. Lamellae and septal walls perforated. Circopora , n. g. 
C. multitubulosa ) Morah, p] 20. C. faverlata ) Morah, p. 20. Wentzel 
(92). 
SIPHONOPHORA . 
y/ Pleuropliysa, n. g., FeWkes (29), destitute of nectocalyces and hydro- 
phyllia. The axis is thick, and all the appendages arise from one side of 
the stem. P. insignis , Gulf Stream, p. 517. 
ACRASPEDA. 
^ Halmonises, n. g., von KeNnEl (49). Without marginal knobs, cirrhi, or 
marginal vesicles. Sixteen to eighteen tentacles, with swollen bases and 
a simple pigment ring on the outer side. Yelum thin, but broad. Manu- 
brium quadrangular, without oral-lappets. Four radial canals, with 
gonads. 2-2£ mm. in diameter. H. Iacu9tris y fresh water lagoon, W. 
Indies. 
Graptolitidj;. 
Holm (47) describes Dictyonema cervicorne , P. abnorme, Retiolites 
geinitzianus . 
ToRNQtJiST (85) describes Clonograptus robustus, Tetragraptus curvatus , 
Didymograptus gracilis , D. decens, Climacograptus internexus , Diplograptus 
bellulus. 
