of South Devon and South Cornwall, — 307 
The erect cylindrical stalks are the free extremities of a branched 
creeping base, which spreads, like an Alecto, over the surface of 
shell or stone. A number of branches radiate from a common 
stem, along which tubular cells are ranged, and each of these 
branches terminates in a free portion, somewhat clavate, at times 
expanding into an enlarged head, from all sides of which long: 
waved tubes project. Mr. Couch has not described the common 
creeping base. It would pass for an Alecto, in the absence of 
the erect portions. 
- I feel much doubt whether this form is correctly referred to 
the genus Pustulopora. It is probably the Tubulipora deflexa of 
Couch, the free and erect branches agreeing exactly with his 
description and figure. But no mention is made by him of a 
branched creeping stem, nor is there any in the diagnosis of 
Pustulopora as given by De Blainville, Johnston, or Busk. In 
a beautiful specimen dredged near Berry Head, the free por- 
tions are dichotomously branched, the branches terminating in 
a triplet of clavate expansions. From the nature of the habitat, 
the creeping stem is in this case very incorispicuous; but on 
stone there is little variation in the form. The creeping 
branches which radiate from a common stem are adnate through 
a great part of their course, and bristle with long tubes, but. 
towards the extremities they become erect, cylindrical, subclayate, 
and bear the cells on all sides. The surface is punctate, This 
species has the closest affinity with Alecto. 
‘Fam. Tubuliporide, Busk. 
1, Tusuxreora, Lamarck. 
1. 7. serpens, Linn. 
Very common, on stones, shells, and Zoophytes from deep 
water: on Pinne from 60 fathoms, off the Deadman ; on Gor- 
gonia (very fine), &c. 
Some of the specimens on Pinna exhibit a very beautiful 
mode of growth. They are of radiate form, attached to the 
shell at the centre only, the bifid branches being free and sub- 
erect, 
2. T. lobulata, Hassall. 
Occasional, on shell: Torbay. 
_ This is probably a good species, and not, as Dr. Johnston 
was inclined to consider it, a variety of the preceding. 
There are important differences between the two forms, in the 
character and disposition of the cells as well as in the mode of 
growth. The cells of 7. lobulata are short and stout, and pro- 
ject very slightly from the crust, They are horizontal, and are 
